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.

1476 vulnerabilities reference this CWE, most recent first.

CVE-2026-32974 (GCVE-0-2026-32974)

Vulnerability from cvelistv5 – Published: 2026-03-29 12:44 – Updated: 2026-06-23 16:15
VLAI
Title
OpenClaw < 2026.3.12 - Forged Event Injection via Feishu Webhook Verification Token
Summary
OpenClaw before 2026.3.12 contains an authentication bypass vulnerability in Feishu webhook mode when only verificationToken is configured without encryptKey, allowing acceptance of forged events. Unauthenticated network attackers can inject forged Feishu events and trigger downstream tool execution by reaching the webhook endpoint.
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-01 15:32 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6398 records in the last 180 days details
References
Impacted products
Vendor Product Version
OpenClaw OpenClaw Affected: 0 , < 2026.3.12 (semver)
Unaffected: 2026.3.12 (semver)
    cpe:2.3:a:openclaw:openclaw:*:*:*:*:*:node.js:*:*
Create a notification for this product.
Date Public
2026-03-13 00:00
Credits
lintsinghua
Show details on NVD website
To clipboard 

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CVE-2026-32883 (GCVE-0-2026-32883)

Vulnerability from cvelistv5 – Published: 2026-03-30 20:36 – Updated: 2026-04-02 14:10
VLAI
Title
Botan: Missing OCSP Response Signature Verification Allows MitM Certificate Revocation Bypass
Summary
Botan is a C++ cryptography library. From version 3.0.0 to before version 3.11.0, during X509 path validation, OCSP responses were checked for an appropriate status code, but critically omitted verifying the signature of the OCSP response itself. This issue has been patched in version 3.11.0.
Severity
5.9 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-02 14:09 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7730 records in the last 180 days details
References
Impacted products
Vendor Product Version
randombit botan Affected: >= 3.0.0, < 3.11.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-32614 (GCVE-0-2026-32614)

Vulnerability from cvelistv5 – Published: 2026-03-13 20:14 – Updated: 2026-03-16 20:12
VLAI
Title
Go ShangMi SM9 Infinity-Point Ciphertext Forgery Vulnerability
Summary
Go ShangMi (Commercial Cryptography) Library (GMSM) is a cryptographic library that covers the Chinese commercial cryptographic public algorithms SM2/SM3/SM4/SM9/ZUC. Prior to 0.41.1, the current SM9 decryption implementation contains an infinity-point ciphertext forgery vulnerability. The root cause is that, during decryption, the elliptic-curve point C1 in the ciphertext is only deserialized and checked to be on the curve, but the implementation does not explicitly reject the point at infinity. In the current implementation, an attacker can construct C1 as the point at infinity, causing the bilinear pairing result to degenerate into the identity element in the GT group. As a result, a critical part of the key derivation input becomes a predictable constant. An attacker who only knows the target user's UID can derive the decryption key material and then forge a ciphertext that passes the integrity check. This vulnerability is fixed in 0.41.1.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-16 20:11 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7730 records in the last 180 days details
References
Impacted products
Vendor Product Version
emmansun gmsm Affected: < 0.41.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-32294 (GCVE-0-2026-32294)

Vulnerability from cvelistv5 – Published: 2026-03-17 17:19 – Updated: 2026-03-17 18:12
VLAI
Title
JetKVM insufficient firmware verification
Summary
JetKVM prior to 0.5.4 does not verify the authenticity of downloaded firmware files. An attacker-in-the-middle or a compromised update server could modify the firmware and the corresponding SHA256 hash to pass verification.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
7 (High)
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:H/SI:H/SA:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · cisa-cg (v2.0.3)
Decision recorded 2026-03-11 17:25 UTC
CWE
  • CWE-345 - Insufficient Verification of Data Authenticity
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
cisa-cg CNA under the CISA root
CNA scorecard B 76/100 over 127 records in the last 180 days details
References
Impacted products
Vendor Product Version
JetKVM JetKVM Affected: 0 , < 0.5.4 (custom)
Unaffected: 0.5.4
Create a notification for this product.
Date Public
2026-03-17 00:00
Credits
Paul Asadoorian, Eclypsium
Show details on NVD website
To clipboard 

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CVE-2026-31946 (GCVE-0-2026-31946)

Vulnerability from cvelistv5 – Published: 2026-03-30 20:31 – Updated: 2026-03-31 14:08
VLAI
Title
OpenOLAT: Authentication bypass via forged JWT in OIDC implicit flow
Summary
OpenOlat is an open source web-based e-learning platform for teaching, learning, assessment and communication. From version 10.5.4 to before version 20.2.5, OpenOLAT's OpenID Connect implicit flow implementation does not verify JWT signatures. The JSONWebToken.parse() method silently discards the signature segment of the compact JWT (header.payload.signature), and the getAccessToken() methods in both OpenIdConnectApi and OpenIdConnectFullConfigurableApi only validate claim-level fields (issuer, audience, state, nonce) without any cryptographic signature verification against the Identity Provider's JWKS endpoint. This issue has been patched in version 20.2.5.
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 2026-03-31 14:07 UTC
CWE
  • CWE-287 - Improper Authentication
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7730 records in the last 180 days details
References
Impacted products
Vendor Product Version
OpenOLAT OpenOLAT Affected: >= 10.5.4, < 20.2.5
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-29000 (GCVE-0-2026-29000)

Vulnerability from cvelistv5 – Published: 2026-03-04 21:49 – Updated: 2026-10-08 15:22
VLAI
Title
pac4j-jwt JwtAuthenticator Authentication Bypass
Summary
pac4j-jwt versions prior to 4.5.9, 5.7.9, and 6.3.3 contain an authentication bypass vulnerability in JwtAuthenticator when processing encrypted JWTs that allows remote attackers to forge authentication tokens. Attackers who possess the server's RSA public key can create a JWE-wrapped PlainJWT with arbitrary subject and role claims, bypassing signature verification to authenticate as any user including administrators.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-07 04:55 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 6398 records in the last 180 days details
References
Impacted products
Vendor Product Version
pac4j pac4j-jwt Affected: 4.0 , < 4.5.9 (custom)
Affected: 5.0 , < 5.7.9 (custom)
Affected: 6.0 , < 6.3.3 (custom)
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    cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*
    cpe:2.3:a:pac4j:pac4j:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
CodeAnt AI Security
Show details on NVD website
To clipboard 

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CVE-2026-28802 (GCVE-0-2026-28802)

Vulnerability from cvelistv5 – Published: 2026-03-06 06:44 – Updated: 2026-09-10 12:05
VLAI
Title
Authlib: Setting `alg: none` and a blank signature appears to bypass signature verification
Summary
Authlib is a Python library which builds OAuth and OpenID Connect servers. From version 1.6.5 to before version 1.6.7, previous tests involving passing a malicious JWT containing alg: none and an empty signature was passing the signature verification step without any changes to the application code when a failure was expected.. This issue has been patched in version 1.6.7.
Severity
7.7 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-06 16:00 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7730 records in the last 180 days details
References
Impacted products
Vendor Product Version
authlib authlib Affected: >= 1.6.5, < 1.6.7
Create a notification for this product.
Red Hat Red Hat Ansible Automation Platform 2.6 Unaffected: 1774417022 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
Create a notification for this product.
Red Hat Red Hat Quay 3.10 Unaffected: 1773971077 , < * (rpm)
    cpe:/a:redhat:quay:3.10::el8
Create a notification for this product.
Red Hat Red Hat Quay 3.12 Unaffected: 1773771962 , < * (rpm)
    cpe:/a:redhat:quay:3.12::el8
Create a notification for this product.
Red Hat Red Hat Quay 3.15 Unaffected: 1775169219 , < * (rpm)
    cpe:/a:redhat:quay:3.15::el8
Create a notification for this product.
Red Hat Red Hat Quay 3.16 Unaffected: 1779204086 , < * (rpm)
    cpe:/a:redhat:quay:3.16::el9
Create a notification for this product.
Red Hat Red Hat Quay 3.9 Unaffected: 1773936323 , < * (rpm)
    cpe:/a:redhat:quay:3.9::el8
Create a notification for this product.
Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-28432 (GCVE-0-2026-28432)

Vulnerability from cvelistv5 – Published: 2026-03-09 21:19 – Updated: 2026-03-10 14:45
VLAI
Title
HTTP signature verification can be bypassed
Summary
Misskey is an open source, federated social media platform. All Misskey servers prior to 2026.3.1 contain a vulnerability that allows bypassing HTTP signature verification. Although this is a vulnerability related to federation, it affects all servers regardless of whether federation is enabled or disabled. This vulnerability is fixed in 2026.3.1.
Severity
7.1 (High)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-10 14:45 UTC
CWE
  • CWE-347 - Improper Verification of Cryptographic Signature
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7730 records in the last 180 days details
References
Impacted products
Vendor Product Version
misskey-dev misskey Affected: < 2026.3.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2026-28199 (GCVE-0-2026-28199)

Vulnerability from cvelistv5 – Published: 2026-09-18 11:19 – Updated: 2026-09-18 14:31
VLAI
Title
Sensitive File Disclosure via Relative Path Traversal in NetBackup Flex OS Shell
Summary
An authenticated user with access to the NetBackup Flex OS management shell could read arbitrary files from the underlying operating system by supplying a specially crafted path argument to a diagnostic command. Successful exploitation could expose sensitive system configuration and credential material stored on the appliance.
Severity
4.8 (Medium)
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
3.3 (Low)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 14:14 UTC
CWE
  • CWE-347 - Improper verification of cryptographic signature
Assigner
ENISA CNA under the ENISA root
CNA scorecard B 80/100 over 40 records in the last 180 days details
References
Impacted products
Vendor Product Version
Cohesity NetBackup Flex OS Affected: 0 , < 6.4 (custom)
Create a notification for this product.
Credits
Francesco Caserta (ACN)
Show details on NVD website
To clipboard 

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CVE-2026-28198 (GCVE-0-2026-28198)

Vulnerability from cvelistv5 – Published: 2026-09-18 11:12 – Updated: 2026-09-18 14:31
VLAI
Title
Privilege Escalation via Cryptographic Signature Verification Bypass in NetBackup Flex OS Shell
Summary
An authenticated, low-privileged user with access to the NetBackup Flex OS management shell could bypass the cryptographic signature verification step of a privileged support command by supplying a specially formed access credential. Successful exploitation grants the attacker an unrestricted root shell with full control over the Flex appliance host and all hosted containers, completely compromising confidentiality, integrity, and availability.
Severity
9.4 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
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 2026-09-18 14:14 UTC
CWE
  • CWE-347 - Improper verification of cryptographic signature
Assigner
ENISA CNA under the ENISA root
CNA scorecard B 80/100 over 40 records in the last 180 days details
References
Impacted products
Vendor Product Version
Cohesity NetBackup Flex OS Affected: 0 , < 6.4 (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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              "value": "An authenticated, low-privileged user with access to the NetBackup Flex \nOS management shell could bypass the cryptographic signature \nverification step of a privileged support command by supplying a \nspecially formed access credential. Successful exploitation grants the \nattacker an unrestricted root shell with full control over the Flex \nappliance host and all hosted containers, completely compromising \nconfidentiality, integrity, and availability.\n\n\u003cbr\u003e"
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "attackVector": "NETWORK",
            "baseScore": 9.4,
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            "exploitMaturity": "NOT_DEFINED",
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            "providerUrgency": "NOT_DEFINED",
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            "subConfidentialityImpact": "HIGH",
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            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "value": "GENERAL"
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          ]
        },
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            "attackVector": "NETWORK",
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            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          "scenarios": [
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-347",
              "description": "CWE-347 Improper verification of cryptographic signature",
              "lang": "en",
              "type": "CWE"
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          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T11:12:23.941Z",
        "orgId": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
        "shortName": "ENISA"
      },
      "references": [
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          "tags": [
            "government-resource"
          ],
          "url": "https://www.cvcn.gov.it/cvcn/cve/CVE-2026-28198"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/cohesity/SecAdvisory/blob/master/COH-2026-0001.md"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Privilege Escalation via Cryptographic Signature Verification Bypass in NetBackup Flex OS Shell",
      "workarounds": [
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          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Restrict management shell access to authorized administrators only. No \ncompensating control fully eliminates the risk; upgrading is required."
            }
          ],
          "value": "Restrict management shell access to authorized administrators only. No \ncompensating control fully eliminates the risk; upgrading is required."
        }
      ],
      "x_generator": {
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158",
    "assignerShortName": "ENISA",
    "cveId": "CVE-2026-28198",
    "datePublished": "2026-09-18T11:12:23.941Z",
    "dateReserved": "2026-02-25T14:02:29.493Z",
    "dateUpdated": "2026-09-18T14:31:44.992Z",
    "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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