Common Weakness Enumeration
CWE-347
AllowedImproper Verification of Cryptographic Signature
Abstraction: Base · Status: Draft
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
1186 vulnerabilities reference this CWE, most recent first.
CVE-2026-65616 (GCVE-0-2026-65616)
Vulnerability from cvelistv5 – Published: 2026-07-27 19:34 – Updated: 2026-07-27 20:05
VLAI
EPSS
VEX
Title
Potential privilege escalation to JFrog administrator privileges
Summary
Incorrect authorization validation in refresh token signature allows non-admin users to obtain a signed JFrog administrator token.
Severity
8.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://docs.jfrog.com/releases/docs/jfrog-securi… | vendor-advisory |
| https://docs.jfrog.com/releases/docs/artifactory-… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| jfrog | artifactory |
Affected:
0 , < 7.146.27
(custom)
|
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CVE-2026-64623 (GCVE-0-2026-64623)
Vulnerability from cvelistv5 – Published: 2026-07-20 12:04 – Updated: 2026-07-20 13:49
VLAI
EPSS
VEX
Title
Network-AI before 5.13.4 Cryptographic Signature Verification Bypass
Summary
Network-AI before 5.13.4 contains an improper cryptographic signature verification vulnerability in APSAdapter where the default local verifier accepts any non-empty string as valid. Unauthenticated attackers can submit forged APS delegation payloads with arbitrary scopes to bypass signature verification and obtain signed permission-grant tokens for sensitive resources including SHELL_EXEC.
Severity
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/Jovancoding/Network-AI/securit… | vendor-advisory |
| https://www.vulncheck.com/advisories/network-ai-b… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Jovancoding | Network-AI |
Affected:
0 , < 5.13.4
(semver)
Unaffected: 5.13.4 (semver) |
Date Public
2026-07-05 00:00
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CVE-2026-62918 (GCVE-0-2026-62918)
Vulnerability from cvelistv5 – Published: 2026-08-06 22:37 – Updated: 2026-08-07 14:51 Exclusively Hosted Service
VLAI
EPSS
VEX
Title
Microsoft Teams Spoofing Vulnerability
Summary
Improper verification of cryptographic signature in Microsoft Teams allows an unauthorized attacker to perform spoofing over a network.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Microsoft Teams |
Affected:
-
|
Date Public
2026-08-06 14:00
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CVE-2026-62873 (GCVE-0-2026-62873)
Vulnerability from cvelistv5 – Published: 2026-08-06 22:37 – Updated: 2026-08-08 03:55 Exclusively Hosted Service
VLAI
EPSS
VEX
Title
Microsoft 365 Admin Center Elevation of Privilege Vulnerability
Summary
Improper verification of cryptographic signature in Microsoft 365 Admin Center allows an unauthorized attacker to elevate privileges over a network.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerabi… | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Microsoft | Microsoft 365 Admin Center |
Affected:
-
|
Date Public
2026-08-06 14:00
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CVE-2026-59643 (GCVE-0-2026-59643)
Vulnerability from cvelistv5 – Published: 2026-08-03 00:51 – Updated: 2026-08-03 13:28
VLAI
EPSS
VEX
Title
OpenPGP inline-signature policy failures silently ignored
Summary
In Bouncy Castle for Java before 1.85, OpenPGP inline-signature policy failures silently ignored. This issue also affects Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 2.0.13.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bcgit/bc-java/wiki/CVE%E2%80%9… | vendor-advisory |
| https://github.com/bcgit/bc-java/commit/d3f8cc408… | patch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Legion of the Bouncy Castle Inc. | BC-JAVA |
Affected:
1.81 , < 1.85
(maven)
|
|
| Legion of the Bouncy Castle Inc. | BC-FJA |
Affected:
2.0.12 , < 2.0.13
(maven)
|
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CVE-2026-59639 (GCVE-0-2026-59639)
Vulnerability from cvelistv5 – Published: 2026-08-03 00:56 – Updated: 2026-08-03 13:24
VLAI
EPSS
VEX
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).
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/bcgit/bc-java/wiki/CVE%E2%80%9… | vendor-advisory |
| https://github.com/bcgit/bc-java/commit/99ddc6dcc… | patch |
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Legion of the Bouncy Castle Inc. | BC-JAVA |
Affected:
0 , < 1.85
(maven)
|
|
| Legion of the Bouncy Castle Inc. | BC-LTS-JAVA |
Affected:
2.73.0 , < 2.73.12
(maven)
|
|
| 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) |
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CVE-2026-59243 (GCVE-0-2026-59243)
Vulnerability from cvelistv5 – Published: 2026-07-29 08:35 – Updated: 2026-07-29 15:30
VLAI
EPSS
VEX
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`.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
3 references
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Apache Software Foundation | Apache Airflow FAB provider |
Affected:
0 , < 3.7.3
(semver)
|
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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
EPSS
VEX
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
Severity
9.6 (Critical)
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/go-gitea/gitea/security/adviso… | vendor-advisory |
| https://github.com/go-gitea/gitea/pull/37707 | patch |
| https://github.com/go-gitea/gitea/releases/tag/v1.26.2 | release-notes |
| https://blog.gitea.com/release-of-1.26.2/ | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Gitea | Gitea Open Source Git Server |
Affected:
1.22.0 , ≤ 1.26.1
(semver)
|
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CVE-2026-58262 (GCVE-0-2026-58262)
Vulnerability from cvelistv5 – Published: 2026-08-07 22:00 – Updated: 2026-08-07 22:00
VLAI
EPSS
VEX
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.
Severity
CWE
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://github.com/klever-io/klever-go/security/a… | x_refsource_CONFIRM |
| https://github.com/klever-io/klever-go/commit/a11… | x_refsource_MISC |
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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
EPSS
VEX
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.
Severity
10 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Siemens | Opcenter X |
Affected:
0 , < V2604
(custom)
|
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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.