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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.

1320 vulnerabilities reference this CWE, most recent first.

CVE-2026-59639 (GCVE-0-2026-59639)

Vulnerability from cvelistv5 – Published: 2026-08-03 00:56 – Updated: 2026-08-03 13:24
VLAI
Title
CMS verifySignatures returns true for SignedData with zero signers
Summary
In Bouncy Castle for Java before 1.85, CMS verifySignatures returns true for SignedData with zero signers. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.12 (1.0.X series), 2.0.12 (2.0.X series) and 2.1.12 (2.1.X series).
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-03 13:24 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Impacted products
Vendor Product Version
Legion of the Bouncy Castle Inc. BC-JAVA Affected: 0 , < 1.85 (maven)
Create a notification for this product.
Legion of the Bouncy Castle Inc. BC-LTS-JAVA Affected: 2.73.0 , < 2.73.12 (maven)
Create a notification for this product.
Legion of the Bouncy Castle Inc. BC-FJA Affected: 1.0.0 , < 1.0.12 (maven)
Affected: 2.0.0 , < 2.0.12 (maven)
Affected: 2.1.0 , < 2.1.12 (maven)
Create a notification for this product.
Show details on NVD website

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CVE-2026-59243 (GCVE-0-2026-59243)

Vulnerability from cvelistv5 – Published: 2026-07-29 08:35 – Updated: 2026-09-08 16:41
VLAI
Title
Apache Airflow FAB provider: FAB auth manager: JWT signature verification disabled by default for Azure AD OAuth (`verify_signature` defaults to `False`)
Summary
The FAB auth manager's Azure AD OAuth login defaulted `verify_signature=False` when decoding the ID token, so an attacker able to present a forged or unsigned (`alg:none`) ID token to the OAuth callback could bypass authentication and log in as an arbitrary user, including one holding the Admin role (CWE-347). Deployments running the FAB auth manager with the Azure AD OAuth login path under its default configuration are affected; the Authentik path already defaulted to `True`. This issue affects `apache-airflow-providers-fab` before 3.7.3. Users are advised to upgrade to `apache-airflow-providers-fab` 3.7.3, which defaults `verify_signature=True`.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-29 15:29 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Impacted products
Show details on NVD website

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CVE-2026-59112 (GCVE-0-2026-59112)

Vulnerability from cvelistv5 – Published: 2026-08-10 13:57 – Updated: 2026-08-10 17:55
VLAI
Title
Signature validation vulnerability affecting DigiDoc applications
Summary
Improper verification of cryptographic signature and Improper Check for Unusual or Exceptional Conditions vulnerability in Estonian Information System Authority (RIA) libdigidocpp, DigiDoc4, DigiDoc on Android, and DigiDoc on iOS. This issue affects libdigidocpp: from 4.1.0 before 4.2.1; DigiDoc4: from 4.7.0 before 4.8.2; DigiDoc on Android: from 2.7.0 before 2.7.2; DigiDoc on iOS: from 2.8.0 before 2.8.1.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-10 17:55 UTC
CWE
  • CWE-347 - Improper verification of cryptographic signature
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
Show details on NVD website

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CVE-2026-58426 (GCVE-0-2026-58426)

Vulnerability from cvelistv5 – Published: 2026-07-03 20:54 – Updated: 2026-07-06 15:07
VLAI
Title
Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task upload-state write
Summary
Gitea Actions Artifacts V4 signed URL HMAC ambiguity allows cross-repository artifact read and cross-task upload-state write
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-06 15:07 UTC
CWE
Impacted products
Vendor Product Version
Gitea Gitea Open Source Git Server Affected: 1.22.0 , ≤ 1.26.1 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-58262 (GCVE-0-2026-58262)

Vulnerability from cvelistv5 – Published: 2026-08-07 22:00 – Updated: 2026-08-12 22:15
VLAI
Title
Klever-Go: PubKeysBitmap padding bits bypass the BLS signature quorum
Summary
Klever-Go is the Go implementation of the Klever blockchain protocol. Prior to 1.7.20, header signature verification counts the unused padding bits of the PubKeysBitmap toward the two-thirds validator quorum. These padding bits do not correspond to any validator and are ignored by the actual BLS aggregate-signature check, so a malicious or compromised block producer can set them to reach the required quorum while gathering fewer genuine validator signatures than the protocol demands. As a result, nodes that import or intercept the header accept it as correctly signed without a real two-thirds quorum, weakening consensus safety and undermining finality. This issue is fixed in version 1.7.20.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 22:08 UTC
CWE
  • CWE-345 - Insufficient Verification of Data Authenticity
  • CWE-347 - Improper Verification of Cryptographic Signature
References
Impacted products
Vendor Product Version
klever-io klever-go Affected: < 1.7.20
Create a notification for this product.
Show details on NVD website

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CVE-2026-58085 (GCVE-0-2026-58085)

Vulnerability from cvelistv5 – Published: 2026-08-19 07:38 – Updated: 2026-08-27 16:03
VLAI
Title
Missing MAC validation in wg(4) packet decryption
Summary
After dispatching a decrypt operation to OCF and receiving the result, the wg(4) driver failed to check whether the MAC verification step succeeded. The driver thus silently accepted packets with an invalid Poly1305 authentication tag. A remote attacker who can send UDP packets to a WireGuard endpoint, and who can guess the bounds of the receiver's replay window, can inject forged or modified transport data packets into the tunnel. A remote attacker who can intercept WireGuard packets bound for a FreeBSD host can modify the ciphertext and authenticated data without detection by the receiver.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-27 16:03 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
References
Impacted products
Vendor Product Version
FreeBSD FreeBSD Affected: 15.1-RELEASE , < p2 (release)
Affected: 15.0-RELEASE , < p12 (release)
Affected: 14.4-RELEASE , < p8 (release)
Create a notification for this product.
Date Public
2026-07-29 22:40
Show details on NVD website

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CVE-2026-57910 (GCVE-0-2026-57910)

Vulnerability from cvelistv5 – Published: 2026-08-25 11:47 – Updated: 2026-09-09 14:57
VLAI
Title
WatchGuard Agent improper authentication allows unauthenticated remote code execution
Summary
Improper authentication in the WatchGuard Agent allows an unauthenticated attacker with network access to cause the agent to execute arbitrary code with elevated privileges.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-25 12:53 UTC
References
Impacted products
Vendor Product Version
WatchGuard WatchGuard Agent Affected: 0 , < 1.17.01.0000 (semver)
Create a notification for this product.
WatchGuard WatchGuard Agent Affected: 0 , < 1.25.13.0000 (semver)
Create a notification for this product.
WatchGuard WatchGuard Agent Affected: 0 , < 1.17.21.0000 (semver)
Create a notification for this product.
Date Public
2026-08-25 11:47
Show details on NVD website

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CVE-2026-57098 (GCVE-0-2026-57098)

Vulnerability from cvelistv5 – Published: 2026-09-08 17:10 – Updated: 2026-09-11 22:09
VLAI
Title
Microsoft Remote Desktop App for Windows Information Disclosure Vulnerability
Summary
Improper verification of cryptographic signature in Windows RDP Client allows an unauthorized attacker to disclose information over a network.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 19:52 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
References
Impacted products
Vendor Product Version
Microsoft Remote Desktop client for Windows Desktop Affected: 1.2.0.0 , < 1.2.7279.0 (custom)
    cpe:2.3:a:microsoft:remote_desktop:*:*:*:*:*:windows:*:*
Create a notification for this product.
Date Public
2026-09-08 14:00
Show details on NVD website

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CVE-2026-56451 (GCVE-0-2026-56451)

Vulnerability from cvelistv5 – Published: 2026-07-14 09:19 – Updated: 2026-07-14 14:30
VLAI
Summary
A vulnerability has been identified in Opcenter X (All versions < V2604). Affected applications do not properly validate the algorithm specified in the JSON Web Token (JWT) header. This could allow an unauthenticated remote attacker to forge arbitrary JWT, bypass authentication mechanisms and impersonate any user including administrative accounts, potentially gaining full unauthorized access to the application.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-14 14:26 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Impacted products
Vendor Product Version
Siemens Opcenter X Affected: 0 , < V2604 (custom)
Create a notification for this product.
Show details on NVD website

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CVE-2026-56207 (GCVE-0-2026-56207)

Vulnerability from cvelistv5 – Published: 2026-09-09 10:36 – Updated: 2026-09-10 17:58
VLAI
Title
Apache Impala: SAML authentication bypass via forged bearer token
Summary
Signature of Bearer token is not verified in last step of SAML2 authentication for Impala's hs2-http interface, allowing altering user name and acting as another user. This issue affects Apache Impala: >=4.0.0. Users are recommended to upgrade to version 4.5.2, which fixes this issue.
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-10 17:57 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Impacted products
Vendor Product Version
Apache Software Foundation Apache Impala Affected: 4.0.0 , ≤ 4.5.1 (semver)
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.