Common Weakness Enumeration

CWE-347

Allowed

Improper Verification of Cryptographic Signature

Abstraction: Base · Status: Draft

API response cwe.mitre.org

The product does not verify, or incorrectly verifies, the cryptographic signature for data.

688 vulnerabilities reference this CWE, most recent first.

CVE-2026-105459 (GCVE-0-2026-105459)

Vulnerability from cvelistv5 – Published: 2026-11-07 04:31 – Updated: 2026-11-07 04:31
VLAI
Title
Multiple Vulnerabilities in IBM API Connect
Summary
IBM API Connect 10.0.8.0 through 10.0.8.12 and 12.1.0.0 through 12.1.1.2 could allow an attacker to gain unauthorized access to an organization due to improper verification of a cryptographic signature. A token is accepted without its signature being fully verified, which could allow an attacker to join an organization without a valid invitation.
Severity
6.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
ibm CNA
References
Impacted products
Vendor Product Version
IBM API Connect Affected: 12.1.0.0 , ≤ 12.1.1.2 (semver)
Affected: 10.0.8.0 , ≤ 10.0.8.12 (semver)
    cpe:2.3:a:ibm:api_connect:12.1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:api_connect:12.1.1.2:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:api_connect:10.0.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:api_connect:10.0.8.12:*:*:*:*:*:*:*
Create a notification for this product.
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CVE-2026-105161 (GCVE-0-2026-105161)

Vulnerability from cvelistv5 – Published: 2026-10-04 16:30 – Updated: 2026-10-06 22:02 Unsupported When Assigned
VLAI
Title
invariant-systems-ai aiir Policy Gate signature verification
Summary
A flaw has been found in invariant-systems-ai aiir up to 1.7.0. The affected element is an unknown function of the component Policy Gate Handler. Executing a manipulation can lead to improper verification of cryptographic signature. The attack can be executed remotely. It is advisable to upgrade the affected component. The GitHub repository of this project is not available anymore. This vulnerability only affects products that are no longer supported by the maintainer.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:O/RC:C
5.3 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:O/RC:C
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 22:02 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
  • CWE-345 - Insufficient Verification of Data Authenticity
Assigner
VulDB CNA
References
Impacted products
Vendor Product Version
invariant-systems-ai aiir Affected: 1.0
Affected: 1.1
Affected: 1.2
Affected: 1.3
Affected: 1.4
Affected: 1.5
Affected: 1.6
Affected: 1.7.0
    cpe:2.3:a:invariant-systems-ai:aiir:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
VulDB CNA Team
Show details on NVD website
To clipboard 

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CVE-2026-105118 (GCVE-0-2026-105118)

Vulnerability from cvelistv5 – Published: 2026-10-03 12:14 – Updated: 2026-10-05 14:45
VLAI
Title
OpenAM before 16.1.3 Open Redirect via Unverified id_token_hint in endSession
Summary
OpenAM before 16.1.3 contains an open redirect vulnerability that allows unauthenticated attackers to redirect users by supplying an unverified id_token_hint to the /oauth2/connect/endSession endpoint. Attackers can name any realm client in a forged hint to redirect victims to any registered post-logout URI, enabling phishing that borrows the OpenAM host's trust.
Severity
2.3 (Low)
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
4.7 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 14:45 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
OpenIdentityPlatform OpenAM Affected: 0 , < 16.1.3 (semver)
Unaffected: 16.1.3 (semver)
    cpe:2.3:a:openidentityplatform:openam:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-18 00:00
Credits
rockmelodies santhreal maximthomas tsujiguchitky
Show details on NVD website
To clipboard 

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CVE-2026-104437 (GCVE-0-2026-104437)

Vulnerability from cvelistv5 – Published: 2026-10-02 11:38 – Updated: 2026-10-06 02:42
VLAI
Title
Zebra before 4.4.0 Consensus Split via SIGHASH_SINGLE Missing-Output Handling
Summary
Zebra before 4.4.0 contains a consensus divergence vulnerability in V5 transparent signature verification, computing a ZIP-244 digest for SIGHASH_SINGLE inputs lacking corresponding outputs instead of failing. Attackers can craft V5 transactions with fewer outputs than inputs that Zebra accepts and templates via getblocktemplate, producing blocks zcashd rejects.
Severity
8.3 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-06 02:42 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
ZcashFoundation zebra Affected: 0 , < 4.4.0 (semver)
Unaffected: 4.4.0 (semver)
    cpe:2.3:a:zfnd:zebra:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-05-02 00:00
Credits
sangsoo-osec defuse mpguerra upbqdn
Show details on NVD website
To clipboard 

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CVE-2026-104435 (GCVE-0-2026-104435)

Vulnerability from cvelistv5 – Published: 2026-10-02 11:38 – Updated: 2026-10-02 15:16
VLAI
Title
Zebra 4.4.0 Consensus Divergence via V5 SIGHASH_SINGLE Without Output
Summary
Zebra zebrad 4.4.0 and zebra-script 6.0.0 fail to enforce a ZIP-244 consensus rule, accepting V5 transparent inputs signed with SIGHASH_SINGLE that lack a corresponding output. Attackers can broadcast crafted V5 transactions with more inputs than outputs that Zebra accepts but zcashd rejects, causing a network consensus split.
Severity
8.3 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
7.4 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 15:16 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
ZcashFoundation zebra Affected: 4.4.0 , < 4.4.1 (semver)
Unaffected: 4.4.1 (semver)
Create a notification for this product.
ZcashFoundation zebra Affected: 6.0.0 , < 6.0.1 (semver)
Unaffected: 6.0.1 (semver)
Create a notification for this product.
Date Public
2026-05-04 00:00
Credits
sangsoo-osec fivelittleducks
Show details on NVD website
To clipboard 

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CVE-2026-103902 (GCVE-0-2026-103902)

Vulnerability from cvelistv5 – Published: 2026-10-12 10:25 – Updated: 2026-10-15 18:07
VLAI
Title
DigiDoc improper signature verification
Summary
Improper verification of cryptographic signature vulnerability in DigiDoc libdigidocpp, DigiDoc DigiDoc4, DigiDoc DigiDoc Android, and DigiDoc DigiDoc iOS. The vulnerability allows an attacker to create forged digital signatures that are displayed a valid by affected DigiDoc software.This issue affects libdigidocpp: from 4.0.0 before 4.5.0; DigiDoc4: from 4.6.0 before 4.11.0; DigiDoc Android: from 2.7.0 before 3.1.0; DigiDoc iOS: from 2.7.0 before 3.1.0.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 18:00 UTC
CWE
  • CWE-347 - Improper verification of cryptographic signature
Assigner
ENISA CNA
References
Impacted products
Vendor Product Version
DigiDoc libdigidocpp Affected: 4.0.0 , < 4.5.0 (semver)
Create a notification for this product.
DigiDoc DigiDoc4 Affected: 4.6.0 , < 4.11.0 (semver)
Create a notification for this product.
DigiDoc DigiDoc Android Affected: 2.7.0 , < 3.1.0 (semver)
Create a notification for this product.
DigiDoc DigiDoc iOS Affected: 2.7.0 , < 3.1.0 (semver)
Create a notification for this product.
Date Public
2026-10-12 10:00
Show details on NVD website
To clipboard 

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CVE-2026-103297 (GCVE-0-2026-103297)

Vulnerability from cvelistv5 – Published: 2026-10-13 21:27 – Updated: 2026-10-14 18:32
VLAI
Title
CAI Content Credentials | Improper Verification of Cryptographic Signature (CWE-347)
Summary
CAI Content Credentials is affected by an Improper Verification of Cryptographic Signature vulnerability that could result in a Security feature bypass. An attacker could leverage this vulnerability to bypass security measures and gain unauthorized write access. Exploitation of this issue does not require user interaction.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-14 18:32 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature (CWE-347)
Assigner
adobe CNA
References
Impacted products
Vendor Product Version
Adobe Content Credentials Rust SDK Affected: 0 , ≤ c2pa-v0.90.15 (custom)
Unaffected: c2pa-v0.91.1 (custom)
Create a notification for this product.
Adobe C2PA Tool Affected: 0 , ≤ c2patool-v0.27.15 (custom)
Unaffected: v0.28.1 (custom)
Create a notification for this product.
Adobe Content Credentials JS SDK Affected: 0 , ≤ @contentauth/c2pa-web@0.13.4 (custom)
Unaffected: @contentauth/c2pa-web@0.15.3 (custom)
Create a notification for this product.
Date Public
2026-10-13 17:00
Show details on NVD website
To clipboard 

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CVE-2026-103296 (GCVE-0-2026-103296)

Vulnerability from cvelistv5 – Published: 2026-10-13 21:27 – Updated: 2026-10-14 17:05
VLAI
Title
CAI Content Credentials | Improper Verification of Cryptographic Signature (CWE-347)
Summary
CAI Content Credentials is affected by an Improper Verification of Cryptographic Signature vulnerability that could result in a Security feature bypass. An attacker could leverage this vulnerability to bypass security measures and gain unauthorized write access. Exploitation of this issue does not require user interaction.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-14 17:04 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature (CWE-347)
Assigner
adobe CNA
References
Impacted products
Vendor Product Version
Adobe Content Credentials Rust SDK Affected: 0 , ≤ c2pa-v0.90.15 (custom)
Unaffected: c2pa-v0.91.1 (custom)
Create a notification for this product.
Adobe C2PA Tool Affected: 0 , ≤ c2patool-v0.27.15 (custom)
Unaffected: v0.28.1 (custom)
Create a notification for this product.
Adobe Content Credentials JS SDK Affected: 0 , ≤ @contentauth/c2pa-web@0.13.4 (custom)
Unaffected: @contentauth/c2pa-web@0.15.3 (custom)
Create a notification for this product.
Date Public
2026-10-13 17:00
Show details on NVD website
To clipboard 

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CVE-2026-103245 (GCVE-0-2026-103245)

Vulnerability from cvelistv5 – Published: 2026-10-01 10:41 – Updated: 2026-10-01 15:02
VLAI
Title
n8n before 1.123.80, 2.39.6, and 2.40.1 Missing Webhook Signature Verification
Summary
n8n versions before 1.123.80, from 2.0.0 before 2.39.6, and from 2.40.0 before 2.40.1 fail to verify the x-webflow-signature HMAC in the Webflow Trigger node webhook handler. Unauthenticated attackers can send forged webhook requests with attacker-controlled payloads to trigger workflows and manipulate downstream actions like record creation or API calls.
Severity
6.9 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-01 15:02 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
n8n-io n8n Affected: 0 , < 1.123.80 (semver)
Affected: 2.0.0 , < 2.39.6 (semver)
Affected: 2.40.0 , < 2.40.1 (semver)
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    cpe:2.3:a:n8n:n8n:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-16 00:00
Show details on NVD website
To clipboard 

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CVE-2026-102946 (GCVE-0-2026-102946)

Vulnerability from cvelistv5 – Published: 2026-10-15 18:28 – Updated: 2026-10-15 19:53
VLAI
Title
joserfc: JWS signature verification bypass via empty signatures array in jws.deserialize_json
Summary
joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated. The verify_general_json() loop performs no iterations for the empty array and returns success because no signature check failed, allowing an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic. The issue affects the General JSON Serialization path; compact JWS and JWT decoding, Flattened JSON serialization, and JWE JSON processing do not follow this vulnerable path. This issue is fixed in version 1.7.4.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 19:52 UTC
CWE
  • CWE-290 - Authentication Bypass by Spoofing
  • CWE-345 - Insufficient Verification of Data Authenticity
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
authlib joserfc Affected: < 1.7.4
Create a notification for this product.
Show details on NVD website
To clipboard 

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                "id": "CVE-2026-102946",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T19:52:38.661517Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-15T19:53:09.069Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "joserfc",
          "vendor": "authlib",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.7.4"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated. The verify_general_json() loop performs no iterations for the empty array and returns success because no signature check failed, allowing an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic. The issue affects the General JSON Serialization path; compact JWS and JWT decoding, Flattened JSON serialization, and JWE JSON processing do not follow this vulnerable path. This issue is fixed in version 1.7.4."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-290",
              "description": "CWE-290: Authentication Bypass by Spoofing",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-345",
              "description": "CWE-345: Insufficient Verification of Data Authenticity",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "CWE-347: Improper Verification of Cryptographic Signature",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-15T18:28:06.913Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2"
        },
        {
          "name": "https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe"
        },
        {
          "name": "https://github.com/authlib/joserfc/releases/tag/1.7.4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/authlib/joserfc/releases/tag/1.7.4"
        }
      ],
      "source": {
        "advisory": "GHSA-4pp3-559j-c5c2",
        "discovery": "UNKNOWN"
      },
      "title": "joserfc: JWS signature verification bypass via empty signatures array in jws.deserialize_json"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-102946",
    "datePublished": "2026-10-15T18:28:06.913Z",
    "dateReserved": "2026-09-29T20:24:43.341Z",
    "dateUpdated": "2026-10-15T19:53:09.069Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

No mitigation information available for this CWE.

CAPEC-463: Padding Oracle Crypto Attack

An adversary is able to efficiently decrypt data without knowing the decryption key if a target system leaks data on whether or not a padding error happened while decrypting the ciphertext. A target system that leaks this type of information becomes the padding oracle and an adversary is able to make use of that oracle to efficiently decrypt data without knowing the decryption key by issuing on average 128*b calls to the padding oracle (where b is the number of bytes in the ciphertext block). In addition to performing decryption, an adversary is also able to produce valid ciphertexts (i.e., perform encryption) by using the padding oracle, all without knowing the encryption key.

CAPEC-475: Signature Spoofing by Improper Validation

An adversary exploits a cryptographic weakness in the signature verification algorithm implementation to generate a valid signature without knowing the key.

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