Common Weakness Enumeration

CWE-347

Allowed

Improper Verification of Cryptographic Signature

Abstraction: Base · Status: Draft

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

689 vulnerabilities reference this CWE, most recent first.

CVE-2026-22817 (GCVE-0-2026-22817)

Vulnerability from cvelistv5 – Published: 2026-01-13 19:49 – Updated: 2026-01-14 19:12
VLAI
Title
JWT Algorithm Confusion via Unsafe Default (HS256) in Hono JWT Middleware Allows Token Forgery and Auth Bypass
Summary
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.11.4, there is a flaw in Hono’s JWK/JWKS JWT verification middleware allowed the JWT header’s alg value to influence signature verification when the selected JWK did not explicitly specify an algorithm. This could enable JWT algorithm confusion and, in certain configurations, allow forged tokens to be accepted. As part of this fix, the JWT middleware now requires the alg option to be explicitly specified. This prevents algorithm confusion by ensuring that the verification algorithm is not derived from untrusted JWT header values. This vulnerability is fixed in 4.11.4.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 19:12 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
honojs hono Affected: < 4.11.4
Create a notification for this product.
Show details on NVD website

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CVE-2026-22696 (GCVE-0-2026-22696)

Vulnerability from cvelistv5 – Published: 2026-01-26 21:28 – Updated: 2026-01-27 21:43
VLAI
Title
dcap-qvl has Missing Verification for QE Identity
Summary
dcap-qvl implements the quote verification logic for DCAP (Data Center Attestation Primitives). A vulnerability present in versions prior to 0.3.9 involves a critical gap in the cryptographic verification process within the dcap-qvl. The library fetches QE Identity collateral (including qe_identity, qe_identity_signature, and qe_identity_issuer_chain) from the PCCS. However, it skips to verify the QE Identity signature against its certificate chain and does not enforce policy constraints on the QE Report. An attacker can forge the QE Identity data to whitelist a malicious or non-Intel Quoting Enclave. This allows the attacker to forge the QE and sign untrusted quotes that the verifier will accept as valid. Effectively, this bypasses the entire remote attestation security model, as the verifier can no longer trust the entity responsible for signing the quotes. All deployments utilizing the dcap-qvl library for SGX or TDX quote verification are affected. The vulnerability has been patched in dcap-qvl version 0.3.9. The fix implements the missing cryptographic verification for the QE Identity signature and enforces the required checks for MRSIGNER, ISVPRODID, and ISVSVN against the QE Report. Users of the `@phala/dcap-qvl-node` and `@phala/dcap-qvl-web` packages should switch to the pure JavaScript implementation, `@phala/dcap-qvl`. There are no known workarounds for this vulnerability. Users must upgrade to the patched version to ensure that QE Identity collateral is properly verified.
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-27 21:42 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
  • CWE-295 - Improper Certificate Validation
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
Phala-Network dcap-qvl Affected: < 0.3.9
Create a notification for this product.
Show details on NVD website

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CVE-2026-22097 (GCVE-0-2026-22097)

Vulnerability from cvelistv5 – Published: 2026-07-13 09:10 – Updated: 2026-07-16 15:41
VLAI
Title
Missing firmware validation allows remote code execution
Summary
The firmware update mechanism does not include cryptographic signature validation. This allows anyone with access to the firmware update capability to upload arbitrary files which can then lead to arbitrary code execution.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-13 14:21 UTC
CWE
Assigner
DIVD CNA
References
URL Tags
https://csirt.divd.nl/DIVD-2026-00001/ third-party-advisory
Impacted products
Vendor Product Version
EVbee DC-80 Affected: 0 , < 1.5.1 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-20965 (GCVE-0-2026-20965)

Vulnerability from cvelistv5 – Published: 2026-01-13 17:56 – Updated: 2026-07-30 20:46
VLAI
Title
Windows Admin Center Elevation of Privilege Vulnerability
Summary
Improper verification of cryptographic signature in Windows Admin Center allows an authorized attacker to elevate privileges locally.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-14 04:56 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
microsoft CNA
References
Impacted products
Vendor Product Version
Microsoft Windows Admin Center in Azure Portal Affected: 1.0 , < 0.70.0.0 (custom)
    cpe:2.3:a:microsoft:azure_portal_windows_admin_center:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-01-13 16:00
Show details on NVD website

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CVE-2026-19910 (GCVE-0-2026-19910)

Vulnerability from cvelistv5 – Published: 2026-08-14 20:01 – Updated: 2026-08-17 19:50
VLAI
Title
PAX Technology Q80 Application Installer Signature Verification Bypass Remote Code Execution Vulnerability
Summary
PAX Technology Q80 Application Installer Signature Verification Bypass Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of PAX Technology Q80. Authentication is not required to exploit this vulnerability. The specific flaw exists within the application installer. The issue results from the lack of proper verification of a cryptographic signature before installing an application. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of root. Was ZDI-CAN-30585.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:49 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
zdi CNA
References
Impacted products
Vendor Product Version
PAX Technology Q80 Affected: 2.6.33.6690R
Create a notification for this product.
Date Public
2026-08-14 20:01
Show details on NVD website

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CVE-2026-18569 (GCVE-0-2026-18569)

Vulnerability from cvelistv5 – Published: 2026-08-04 05:13 – Updated: 2026-11-07 11:52
VLAI
Title
Keycloak-services: keycloak-services: oidc backchannel logout accepts unsigned forged logout tokens
Summary
A flaw was found in the backchannel logout endpoint of the keycloak-services component, which is part of the Red Hat Build of Keycloak. This component handles authentication and session management for applications. The issue occurs when an OIDC identity provider is configured to skip signature validation. In this specific setup, the system incorrectly accepts logout requests that have no cryptographic signature. An attacker who knows certain technical details about a user's session can use this flaw to force that user to be logged out, potentially disrupting their work.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-04 14:39 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
redhat CNA
References
URL Tags
https://access.redhat.com/errata/RHSA-2026:95761 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:95762 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-18569 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2509755 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat build of Keycloak 26.6 Unaffected: 26.6.8-2 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.6::el9
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Red Hat Red Hat build of Keycloak 26.6 Unaffected: 26.6-24 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.6::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 26.6.8     cpe:/a:redhat:build_keycloak:26.6::el9
Create a notification for this product.
Red Hat Red Hat Data Grid 8     cpe:/a:redhat:jboss_data_grid:8
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Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack     cpe:/a:redhat:jbosseapxp
Create a notification for this product.
Red Hat Red Hat Single Sign-On 7     cpe:/a:redhat:red_hat_single_sign_on:7
Create a notification for this product.
Date Public
2026-07-31 10:18
Show details on NVD website

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CVE-2026-18568 (GCVE-0-2026-18568)

Vulnerability from cvelistv5 – Published: 2026-08-03 14:38 – Updated: 2026-08-03 20:05
VLAI
Title
XML::Sig versions from 0.29 before 0.72 for Perl allow signature verification bypass because verify returns true when every signature was skipped before any cryptographic check
Summary
XML::Sig versions from 0.29 before 0.72 for Perl allow signature verification bypass because verify returns true when every signature was skipped before any cryptographic check. verify in lib/XML/Sig.pm counts the `//dsig:Signature` elements into `$numsigs` and iterates over them, but two paths reach `next` before any digest or key check runs: a `SignedInfo/Reference/@URI` that resolves to no element while `$numsigs` is greater than 1, and, when `id_attr` is set, a reference that does not match the requested ID. The loop records nothing about what it checked, so when every signature takes one of those paths control reaches the unconditional `return 1` that ends verify. Two `Signature` elements whose Reference URI names an ID that no element carries is enough, as is one such element combined with `id_attr`. Any caller that passes untrusted XML to verify can receive a true return for a document in which no digest and no signature value was checked; a `cert` or `cert_text` trust anchor does not change this, because no key check runs. Versions up to 0.28 use an XML::XPath based verify that has no such skip and are not affected.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 20:05 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
CPANSec CNA
Impacted products
Vendor Product Version
TIMLEGGE XML::Sig Affected: 0.29 , < 0.72 (custom)
Create a notification for this product.
Show details on NVD website

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CVE-2026-18500 (GCVE-0-2026-18500)

Vulnerability from cvelistv5 – Published: 2026-08-15 13:16 – Updated: 2026-08-17 19:45
VLAI
Title
@fastify/jwt vulnerable to authorization bypass via global secret overriding the per-request key
Summary
@fastify/jwt is a JSON Web Token plugin for Fastify. In versions before 10.2.2, a per-request verification key passed to request.jwtVerify({ key }) is silently overridden by the plugin's globally configured secret, because the option merge applies the global key last. Applications that use different keys for different authorization domains, for example separate user and admin keys, therefore accept a token signed with the global key on a route that explicitly requires another key. This lets an ordinary authenticated user cross a key-based trust boundary without knowing either secret. The issue is fixed in @fastify/jwt 10.2.2, where an explicit per-call key takes precedence over the global secret. Users should upgrade to 10.2.2.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-17 19:45 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
openjs CNA
Impacted products
Vendor Product Version
@fastify/jwt @fastify/jwt Affected: 0 , < 10.2.2 (semver)
Unaffected: 10.2.2 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-18397 (GCVE-0-2026-18397)

Vulnerability from cvelistv5 – Published: 2026-10-01 21:49 – Updated: 2026-10-02 19:42
VLAI
Title
SConnect: Native Host Unauthenticated Remote Code Execution Vulnerability
Summary
This vulnerability enables unauthenticated remote code execution (RCE) on a victim's machine by exploiting a combination of cryptographic weaknesses and memory management issues in the SConnect native host component. The attack leverages an unrestricted messaging interface between an attacker-controlled web page and the native host, allowing malicious input to bypass security checks.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 19:40 UTC
CWE
  • CWE-347 - Improper verification of cryptographic signature
  • CWE-130 - Improper handling of length parameter inconsistency
  • CWE-457 - Use of uninitialized variable
  • CWE-252 - Unchecked return value
Assigner
THA-PSIRT CNA
References
Impacted products
Vendor Product Version
Thales SConnect Affected: 0 , < 2.16.1.0 (custom)
Create a notification for this product.
Date Public
2026-10-01 22:10
Show details on NVD website

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CVE-2026-18152 (GCVE-0-2026-18152)

Vulnerability from cvelistv5 – Published: 2026-09-22 22:06 – Updated: 2026-09-23 18:56
VLAI
Title
IBM Financial Transaction Manager (FTM) is Impacted by Multiple Vulnerabilities
Summary
IBM Financial Transaction Manager (FTM) for RedHat OpenShift could allow a remote attacker to forge validly-signed messages due to improper verification of cryptographic signatures.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-23 18:46 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
ibm CNA
References
URL Tags
https://www.ibm.com/support/pages/node/7288641 vendor-advisorypatch
Impacted products
Vendor Product Version
IBM Financial Transaction Manager (FTM) for RedHat OpenShift Affected: 4.0.6.0 , ≤ 4.0.6.0.0.6.0 Refresh (Operator 4.4.6+20260807.081800)4.0.7.04.0.8.04.0.9.04.0.10.0 Interim Fix 064 (semver)
    cpe:2.3:a:ibm:financial_transaction_manager_ftmfor_redhat_openshift:4.0.6.0:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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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.