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CWE-347
Improper Verification of Cryptographic Signature
The product does not verify, or incorrectly verifies, the cryptographic signature for data.
CVE-2026-2746 (GCVE-0-2026-2746)
Vulnerability from cvelistv5 – Published: 2026-03-04 08:44 – Updated: 2026-03-04 21:26
VLAI
Title
Missing PGP Signature Tag
Summary
SEPPmail Secure Email Gateway before version 15.0.1 does not properly communicate PGP signature verification results, leaving users unable to detect forged emails.
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://downloads.seppmail.com/extrelnotes/150/ER… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| SEPPmail | Secure Email Gateway |
Affected:
0 , < 15.0.1
(custom)
|
Credits
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CVE-2026-27962 (GCVE-0-2026-27962)
Vulnerability from cvelistv5 – Published: 2026-03-16 17:34 – Updated: 2026-07-01 12:04
VLAI
Title
Authlib JWS JWK Header Injection: Signature Verification Bypass
Summary
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any JWS deserialization function, the library extracts and uses the cryptographic key embedded in the attacker-controlled JWT jwk header field. An attacker can sign a token with their own private key, embed the matching public key in the header, and have the server accept the forged token as cryptographically valid — bypassing authentication and authorization entirely. This issue has been patched in version 1.6.9.
Severity
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
10 references
| URL | Tags |
|---|---|
| https://github.com/authlib/authlib/security/advis… | x_refsource_CONFIRM |
| https://github.com/authlib/authlib/commit/a5d4b2d… | x_refsource_MISC |
| https://github.com/authlib/authlib/releases/tag/v1.6.9 | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-27962 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2448164 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:5665 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:7314 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:24853 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:19375 | vendor-advisoryx_refsource_REDHAT |
Impacted products
9 products
| Vendor | Product | Version | |
|---|---|---|---|
| authlib | authlib |
Affected:
< 1.6.9
|
|
| Red Hat | Red Hat Quay 3.10 |
cpe:/a:redhat:quay:3.10::el8 |
|
| Red Hat | Red Hat Quay 3.14 |
cpe:/a:redhat:quay:3.14::el8 |
|
| Red Hat | Red Hat Quay 3.15 |
cpe:/a:redhat:quay:3.15::el8 |
|
| Red Hat | Red Hat Quay 3.16 |
cpe:/a:redhat:quay:3.16::el9 |
|
| Red Hat | Lightspeed Core |
cpe:/a:redhat:lightspeed_core |
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2 |
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai |
|
| Red Hat | Red Hat Satellite 6 |
cpe:/a:redhat:satellite:6 |
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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
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://github.com/misskey-dev/misskey/security/a… | x_refsource_CONFIRM |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| misskey-dev | misskey |
Affected:
< 2026.3.1
|
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CVE-2026-28802 (GCVE-0-2026-28802)
Vulnerability from cvelistv5 – Published: 2026-03-06 06:44 – Updated: 2026-07-01 12:04
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
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
12 references
| URL | Tags |
|---|---|
| https://github.com/authlib/authlib/security/advis… | x_refsource_CONFIRM |
| https://github.com/authlib/authlib/commit/a61c2ac… | x_refsource_MISC |
| https://github.com/authlib/authlib/commit/b87c32e… | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-28802 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2445120 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:6309 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:5665 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:4942 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:6568 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:19375 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:5168 | vendor-advisoryx_refsource_REDHAT |
Impacted products
8 products
| Vendor | Product | Version | |
|---|---|---|---|
| authlib | authlib |
Affected:
>= 1.6.5, < 1.6.7
|
|
| Red Hat | Red Hat Ansible Automation Platform 2.6 |
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
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|
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cpe:/a:redhat:quay:3.12::el8 |
|
| Red Hat | Red Hat Quay 3.15 |
cpe:/a:redhat:quay:3.15::el8 |
|
| Red Hat | Red Hat Quay 3.16 |
cpe:/a:redhat:quay:3.16::el9 |
|
| Red Hat | Red Hat Quay 3.9 |
cpe:/a:redhat:quay:3.9::el8 |
|
| Red Hat | Red Hat Satellite 6 |
cpe:/a:redhat:satellite:6 |
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CVE-2026-29000 (GCVE-0-2026-29000)
Vulnerability from cvelistv5 – Published: 2026-03-04 21:49 – Updated: 2026-05-11 23:11
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
9.1 (Critical)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://www.pac4j.org/blog/security-advisory-pac4… | vendor-advisory |
| https://www.codeant.ai/security-research/pac4j-jw… | technical-descriptionexploit |
| https://www.vulncheck.com/advisories/pac4j-jwt-jw… | third-party-advisory |
Impacted products
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CVE-2026-2968 (GCVE-0-2026-2968)
Vulnerability from cvelistv5 – Published: 2026-02-23 03:02 – Updated: 2026-02-23 17:26 X_Open Source
VLAI
Title
Cesanta Mongoose Poly1305 Authentication Tag tls_chacha20.c mg_chacha20_poly1305_decrypt signature verification
Summary
A vulnerability was detected in Cesanta Mongoose up to 7.20. This impacts the function mg_chacha20_poly1305_decrypt of the file /src/tls_chacha20.c of the component Poly1305 Authentication Tag Handler. The manipulation results in improper verification of cryptographic signature. The attack may be launched remotely. This attack is characterized by high complexity. The exploitability is said to be difficult. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.347335 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.347335 | signaturepermissions-required |
| https://vuldb.com/?submit.757091 | third-party-advisory |
| https://github.com/dwBruijn/CVEs/blob/main/Mongoo… | related |
| https://github.com/dwBruijn/CVEs/blob/main/Mongoo… | exploit |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Cesanta | Mongoose |
Affected:
7.0
Affected: 7.1 Affected: 7.2 Affected: 7.3 Affected: 7.4 Affected: 7.5 Affected: 7.6 Affected: 7.7 Affected: 7.8 Affected: 7.9 Affected: 7.10 Affected: 7.11 Affected: 7.12 Affected: 7.13 Affected: 7.14 Affected: 7.15 Affected: 7.16 Affected: 7.17 Affected: 7.18 Affected: 7.19 Affected: 7.20 cpe:2.3:a:cesanta:mongoose:*:*:*:*:*:*:*:* |
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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)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/OpenOLAT/OpenOLAT/security/adv… | x_refsource_CONFIRM |
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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
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Date Public
2026-03-17 00:00
Credits
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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)
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://github.com/emmansun/gmsm/security/advisor… | x_refsource_CONFIRM |
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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)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-347 - Improper Verification of Cryptographic Signature
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/randombit/botan/security/advis… | x_refsource_CONFIRM |
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"other": {
"content": {
"id": "CVE-2026-32883",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-04-02T14:09:48.050314Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-02T14:10:02.578Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "botan",
"vendor": "randombit",
"versions": [
{
"status": "affected",
"version": "\u003e= 3.0.0, \u003c 3.11.0"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-347",
"description": "CWE-347: Improper Verification of Cryptographic Signature",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-30T20:36:30.579Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/randombit/botan/security/advisories/GHSA-9j2j-hqmc-hf5x",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/randombit/botan/security/advisories/GHSA-9j2j-hqmc-hf5x"
}
],
"source": {
"advisory": "GHSA-9j2j-hqmc-hf5x",
"discovery": "UNKNOWN"
},
"title": "Botan: Missing OCSP Response Signature Verification Allows MitM Certificate Revocation Bypass"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-32883",
"datePublished": "2026-03-30T20:36:30.579Z",
"dateReserved": "2026-03-16T21:03:44.421Z",
"dateUpdated": "2026-04-02T14:10:02.578Z",
"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.