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.

689 vulnerabilities reference this CWE, most recent first.

CVE-2026-87732 (GCVE-0-2026-87732)

Vulnerability from cvelistv5 – Published: 2026-09-09 04:03 – Updated: 2026-09-09 13:11
VLAI
Summary
An issue was discovered in the mirage-crypto package before 2.2.0 for OCaml. The AES.GCM.authenticate_decrypt_into and Chacha20.authenticate_decrypt_into functions write the decrypted plaintext into a caller-provided buffer and only then compares the tag. On a forged tag, the functions returns false, but the destination buffer already holds the full plaintext.
Severity
6.2 (Medium)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 13:11 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
mitre CNA
References
Impacted products
Vendor Product Version
OCaml mirage-crypto Affected: 0 , < 2.2.0 (semver)
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Show details on NVD website
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CVE-2026-87696 (GCVE-0-2026-87696)

Vulnerability from cvelistv5 – Published: 2026-10-13 19:01 – Updated: 2026-10-31 18:10
VLAI
Title
Microsoft Exchange Server Elevation of Privilege Vulnerability
Summary
Improper verification of cryptographic signature in Microsoft Exchange Server allows an authorized attacker to elevate privileges over a network.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 00:00 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
microsoft CNA
References
Impacted products
Date Public
2026-10-13 14:00
Show details on NVD website
To clipboard 

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CVE-2026-87103 (GCVE-0-2026-87103)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:08 – Updated: 2026-10-29 10:45
VLAI
Summary
Sensitive information disclosure and manipulation due to improper token validation. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 42587.
Severity
7.4 (High)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-29 03:57 UTC
CWE
Assigner
Acronis CNA
References
Impacted products
Vendor Product Version
Acronis Acronis Cyber Protect 17 Affected: unspecified , < 42587 (semver)
Create a notification for this product.
Show details on NVD website
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CVE-2026-87102 (GCVE-0-2026-87102)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:11 – Updated: 2026-10-29 10:45
VLAI
Summary
Sensitive information disclosure and manipulation due to improper token validation. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 42587.
Severity
7.4 (High)
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-29 03:57 UTC
CWE
Assigner
Acronis CNA
References
Impacted products
Vendor Product Version
Acronis Acronis Cyber Protect 17 Affected: unspecified , < 42587 (semver)
Create a notification for this product.
Show details on NVD website
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CVE-2026-87101 (GCVE-0-2026-87101)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:08 – Updated: 2026-11-06 18:39
VLAI
Summary
Sensitive information disclosure due to improper token validation. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 42587.
Severity
6.2 (Medium)
CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 18:13 UTC
CWE
Assigner
Acronis CNA
References
Impacted products
Vendor Product Version
Acronis Acronis Cyber Protect 17 Affected: unspecified , < 42587 (semver)
Create a notification for this product.
Show details on NVD website
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CVE-2026-87004 (GCVE-0-2026-87004)

Vulnerability from cvelistv5 – Published: 2026-09-30 17:01 – Updated: 2026-09-30 18:01
VLAI
Title
Tugtainer: OIDC id_token claims accepted without signature/audience/expiry verification
Summary
Tugtainer is a self-hosted app for automating updates of Docker containers. Prior to version 1.31.3, when the OIDC login flow completes, backend/modules/auth/providers/auth_oidc_provider.py decodes the id_token returned by the identity provider's token endpoint using jose.jwt.get_unverified_claims() instead of jwt.decode(). This skips signature verification, audience (aud) validation, issuer (iss) validation, and expiry (exp) checking entirely. The extracted claims (email/sub/preferred_username) are then used directly as the user_id for the resulting Tugtainer session. This issue has been patched in version 1.31.3.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-30 18:00 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
Quenary tugtainer Affected: < 1.31.3
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-86585 (GCVE-0-2026-86585)

Vulnerability from cvelistv5 – Published: 2026-09-16 10:13 – Updated: 2026-09-16 17:47
VLAI
Title
Improper Verification of the Firmware Signature vulnerability
Summary
The lack of signature verification of firmware update packages in VEO and VEO-XS Wi-Fi monitors, in versions prior to 01.48.001, allows an attacker who controls the delivery of an update to install unauthorised firmware.
Severity
7.7 (High)
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-16 17:46 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
FERMAX CNA
References
URL Tags
https://fermax.com/security-advisories vendor-advisory
Impacted products
Credits
Pedro J. Núñez-Cacho Fuentes (Tunelko) INCIBE-CERT
Show details on NVD website
To clipboard 

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CVE-2026-86405 (GCVE-0-2026-86405)

Vulnerability from cvelistv5 – Published: 2026-10-09 12:52 – Updated: 2026-10-12 22:54
VLAI
Title
Payment Validation Bypass in Sipay Electronic Money's SanalPos PrestaShop
Summary
Improper verification of cryptographic signature vulnerability in Sipay Electronic Money and Payment Services Inc. PrestaShop Virtual POS Module allows Signature Spoofing by Improper Validation. This issue affects PrestaShop Virtual POS Module: from 26.8.1 before 26.9.1.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-12 22:48 UTC
CWE
  • CWE-347 - Improper verification of cryptographic signature
Assigner
TR-CERT CNA
References
Impacted products
Date Public
2026-10-09 12:47
Credits
Yasin SUER
Show details on NVD website
To clipboard 

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CVE-2026-86326 (GCVE-0-2026-86326)

Vulnerability from cvelistv5 – Published: 2026-10-02 10:21 – Updated: 2026-10-02 10:39
VLAI
Summary
An improper verification of cryptographic signature vulnerability exists in protocol gateways because the device does not properly verify the cryptographic authenticity of firmware images before installation. An attacker with high privileges and access to the firmware update interface could provide a specially crafted or modified firmware image, causing it to be installed on the device. Successful exploitation could allow the attacker to execute unauthorized code, compromise the integrity and availability of the device, and persist malicious modifications across subsequent firmware updates.
Severity
8.6 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-02 10:37 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
Moxa CNA
References
Impacted products
Vendor Product Version
Moxa MGate MB3170 Series Affected: 1.0
    cpe:2.3:a:moxa:mgate_mb3170_series:1.0:*:*:*:*:*:*:*
Create a notification for this product.
Moxa MGate MB3270 Series Affected: 1.0
    cpe:2.3:a:moxa:mgate_mb3270_series:1.0:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-86304 (GCVE-0-2026-86304)

Vulnerability from cvelistv5 – Published: 2026-09-06 22:24 – Updated: 2026-09-08 18:41
VLAI
Title
MojoX::Authentication versions before 0.006 for Perl allow SAML authentication bypass because parse_assertion builds Net::SAML2::Binding::POST without a trust anchor
Summary
MojoX::Authentication versions before 0.006 for Perl allow SAML authentication bypass because parse_assertion builds Net::SAML2::Binding::POST without a trust anchor. parse_assertion in MojoX::Authentication::Model::SAML2 calls Net::SAML2::Binding::POST->new with no cacert, cert_text or anchors argument, then passes the returned XML to Net::SAML2::Protocol::Assertion->new_from_xml with the IdP signing certificate as cacert. In Net::SAML2 before 0.86 that certificate guards only encrypted assertions, so the signature on an unencrypted assertion is checked against the certificate the response itself carries. An attacker starts a SAML login, then posts a response signed with a certificate of their own. The audience, InResponseTo and timestamp checks that follow are all satisfiable by the attacker, so the response authenticates any NameID it carries.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 18:41 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
CPANSec CNA
References
Impacted products
Vendor Product Version
Affected: 0 , < 0.006 (custom)
Show details on NVD website
To clipboard 

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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.

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