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.

1412 vulnerabilities reference this CWE, most recent first.

CVE-2026-71887 (GCVE-0-2026-71887)

Vulnerability from cvelistv5 – Published: 2026-10-03 08:39 – Updated: 2026-10-05 16:04
VLAI
Title
OpenPGP data signature accepted from a signing subkey without cross-certification
Summary
In Bouncy Castle for Java before 1.86, the high-level OpenPGP API accepted a data signature made by a signing subkey whose Subkey Binding signature carried no embedded Primary Key Binding (cross-certification) signature, in the case where that binding omits a Key Flags subpacket. RFC 9580 sec. 5.2.1.8 and sec. 10.1.3 require the embedded Primary Key Binding signature on any subkey that can issue signatures; it is the subkey's own statement that it belongs to the primary key it is bound under. OpenPGPCertificate resolved the subkey's key flags two different ways. isSigningKey() goes through getKeyFlags() and getApplyingSubpacket(), which falls back to the primary key's direct-key or primary User ID self-signature when the binding signature omits the subpacket, so the subkey inherited the primary's SIGN_DATA and counted as signing-capable; verifyEmbeddedPrimaryKeyBinding(), which enforces the requirement, reads the binding signature's own hashed subpackets, found no SIGN_DATA there, and returned early as a non-signing key without ever demanding the back signature. The same subkey was therefore signing-capable - so its signatures were attributed to the certificate and OpenPGPSignature.OpenPGPDocumentSignature.isValid() returned true - while being exempt from cross-certification, where GnuPG refuses the identical certificate and message. An attacker needs only the victim's public signing subkey, which is public material: they bind it to their own primary key with a Subkey Binding signature they are able to make, carrying no Key Flags and no embedded Primary Key Binding signature, which they cannot make without the subkey's private key, and a relying party verifying one of the victim's genuinely signed messages against that certificate is told the signature is valid and given the attacker's certificate as its issuer. Because a certificate's User IDs are self-asserted, a verifier that pins on the subkey's fingerprint or key ID while taking the identity from the enclosing certificate reports a real signature under an attacker-chosen identity. This is misattribution of a genuine signature rather than forgery of a new one: no private key is recovered, and the signature must be one the grafted subkey actually made. The low-level PGPSignature / PGPPublicKeyRing API performs no binding checks by design and is unaffected. Key Flags are a statement about the key the carrying signature refers to (RFC 9580 sec. 5.2.3.29), so a subkey no longer inherits them from the certificate-wide signatures of the primary key: a Subkey Binding signature that omits the subpacket now leaves the subkey with no capabilities rather than the primary's, which makes the flags the cross-certification check consults the same flags every other decision consults. Preferences and the other subpackets a direct-key signature carries are inherited as before, and the primary key itself, whose flags legitimately come from its own direct-key or User ID self-signature, is unaffected.
Severity
8.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/U:Amber
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-05 16:04 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
  • CWE-345 - Insufficient Verification of Data Authenticity
Assigner
References
Impacted products
Vendor Product Version
Legion of the Bouncy Castle Inc. BC-JAVA Affected: 1.81 , < 1.86 (maven)
Create a notification for this product.
Credits
Arpan Sharma
Show details on NVD website
To clipboard 

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CVE-2026-69646 (GCVE-0-2026-69646)

Vulnerability from cvelistv5 – Published: 2026-09-08 18:33 – Updated: 2026-10-01 22:55
VLAI
Title
Skype for Business Spoofing Vulnerability
Summary
Improper verification of cryptographic signature in Skype for Business allows an unauthorized attacker to perform spoofing over an adjacent network.
Severity
8.3 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L/E:U/RL:O/RC:C
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 04:26 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Date Public
2026-09-08 14:00
Show details on NVD website
To clipboard 

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CVE-2026-68759 (GCVE-0-2026-68759)

Vulnerability from cvelistv5 – Published: 2026-08-12 15:15 – Updated: 2026-08-12 18:40
VLAI
Title
Integration credential holders may impersonate users in JFrog Access
Summary
A holder of a valid integration credential may impersonate other users under specific conditions.
Severity
7.2 (High)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 18:40 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
jfrog artifactory Affected: 0 , < 7.146.35 (custom)
Affected: 7.161.0 , < 7.161.16 (custom)
Create a notification for this product.
Credits
OpenAI
Show details on NVD website
To clipboard 

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CVE-2026-68757 (GCVE-0-2026-68757)

Vulnerability from cvelistv5 – Published: 2026-08-12 15:10 – Updated: 2026-08-12 19:01
VLAI
Title
Potential improper SAML signature verification in JFrog Artifactory
Summary
A user with access to a valid SAML response may impersonate another user under specific conditions.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-12 19:01 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
jfrog artifactory Affected: 0 , < 7.146.35 (custom)
Affected: 7.161.0 , < 7.161.16 (custom)
Create a notification for this product.
Credits
Ben Morris in collaboration with Claude and Anthropic Research
Show details on NVD website
To clipboard 

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CVE-2026-68745 (GCVE-0-2026-68745)

Vulnerability from cvelistv5 – Published: 2026-08-21 08:21 – Updated: 2026-08-24 16:58
VLAI
Title
Apache CloudStack: SAML2 Signature Validation Silently Skipped for Cert-less IdP
Summary
Certificate validation failures in SAML authentication in Apache CloudStack 4.20.3.0 and 4.22.1.0 on all platforms allow a malicious agent to forge a SAML response to the management server. The agent will have to spoof the ip address of the IdP or get an url of its own choosing registered in the management server, after which it can allow logging on with forged signatures. Users are recommended to upgrade to versions 4.20.3.1 or 4.22.1.1 and above, which fix this issue.
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: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-24 16:58 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache CloudStack Affected: 4.5.2 , ≤ 4.20.3.0 (semver)
Affected: 4.21.0.0 , ≤ 4.22.1.0 (semver)
Create a notification for this product.
Credits
Katriel Moses <katriel.moses@gmail.com>
Show details on NVD website
To clipboard 

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CVE-2026-67278 (GCVE-0-2026-67278)

Vulnerability from cvelistv5 – Published: 2026-09-05 20:00 – Updated: 2026-09-17 14:20
VLAI
Title
TLS server impersonation possible in Mikrotik RouterOS
Summary
MikroTik RouterOS accepts malformed RSA/PKCS#1 v1.5 signatures across RSA-based services, including TLS/X.509 certificate validation and SSH host-key authentication. Because its trust store includes an e=3 root CA, an attacker controlling or redirecting an outbound RouterOS TLS connection can use the root’s public certificate - without its private key - to forge a trusted intermediate and issue certificates for arbitrary hostnames, enabling TLS server impersonation. The same permissive verification also undermines RSA-based SSH authentication. This issue affects only 7.x branch was fixed in versions: 7.23.6 (Long-term) and 7.24.3 (Stable). Releases 7.23.4 and 7.24.2 included an incomplete fix.
Severity
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-08 15:30 UTC
CWE
  • CWE-347 - Improper verification of cryptographic signature
Assigner
References
Impacted products
Vendor Product Version
Mikrotik RouterOS Affected: 7.24 , < 7.24.3 (custom)
Affected: 7.0.0 , < 7.23.6 (custom)
    cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*
    cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-05 00:00
Credits
Sławomir Rozbicki (CERT.PL) Robert Żegleń
Show details on NVD website
To clipboard 

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CVE-2026-67276 (GCVE-0-2026-67276)

Vulnerability from cvelistv5 – Published: 2026-09-05 20:00 – Updated: 2026-09-09 04:26
VLAI
Title
SSH user impersonation possible in Mikrotik RouterOS
Summary
RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking the key type and modulus but omitting the exponent. Because signature verification uses the client-supplied key, an attacker knowing an authorized RSA modulus can supply a key with exponent one, forge a valid signature, and open an SSH command channel as the target user without the private key.This issue affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)
Severity
9.2 (Critical)
CVSS:4.0/AV:N/AC:H/AT:N/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 2026-09-08 00:00 UTC
CWE
  • CWE-347 - Improper verification of cryptographic signature
Assigner
References
Impacted products
Vendor Product Version
Mikrotik RouterOS Affected: 7.24 , < 7.24.2 (custom)
Affected: 7.9 , < 7.23.4 (custom)
    cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*
    cpe:2.3:a:mikrotik:routeros:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-05 00:00
Credits
Sławomir Rozbicki (CERT.PL)
Show details on NVD website
To clipboard 

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CVE-2026-66776 (GCVE-0-2026-66776)

Vulnerability from cvelistv5 – Published: 2026-08-11 00:19 – Updated: 2026-08-11 14:27
VLAI
Title
Multiple vulnerabilities in SAP Business AI Platform (Approuter)
Summary
SAP Approuter does not consistently enforce integrity verification on certain session-related request headers under specific conditions. An attacker with low privileges could send a specially crafted request that bypasses the integrity check and loads another user's session context. Successful exploitation requires the attacker to have previously observed matching session values out-of-band, which makes the attack complex to execute. This could result in a high impact on confidentiality and a low impact on integrity. There is no impact on availability.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-11 13:16 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
SAP_SE SAP Business AI Platform (Approuter) Affected: SAP Approuter node.js package < 23.0.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-65616 (GCVE-0-2026-65616)

Vulnerability from cvelistv5 – Published: 2026-07-27 19:34 – Updated: 2026-07-27 20:05
VLAI
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)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-27 20:05 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
jfrog artifactory Affected: 0 , < 7.146.27 (custom)
Create a notification for this product.
Credits
Kostya Kortchinsky | OpenAI
Show details on NVD website
To clipboard 

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CVE-2026-64623 (GCVE-0-2026-64623)

Vulnerability from cvelistv5 – Published: 2026-07-20 12:04 – Updated: 2026-08-14 16:50
VLAI
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
8.8 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 13:48 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
Impacted products
Vendor Product Version
Jovancoding Network-AI Affected: 0 , < 5.13.4 (semver)
Unaffected: 5.13.4 (semver)
    cpe:2.3:a:network-ai:network-ai:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-07-05 00:00
Credits
EQSTLab useworld
Show details on NVD website
To clipboard 

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    "datePublished": "2026-07-20T12:04:55.262Z",
    "dateReserved": "2026-07-20T11:58:54.524Z",
    "dateUpdated": "2026-08-14T16:50:36.979Z",
    "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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