CVE-2026-45795: Janssen Project: JWE Request Object Signature Verification Bypass in jans-auth-server

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-16 · updated 2026-10-24
Weakness: CWE-347

Description

The Janssen Project is an open-source identity and access management (IAM) platform. Prior to 2.0.0, jans-auth-server accepts unsigned JWE request objects because JwtAuthorizationRequest skips inner signature validation when jwe.getSignedJWTPayload() returns null, and AuthzRequestService.processRequestObject() does not reject the unrecognized RSA-OAEP algorithm when forceSignedRequestObject=true. This issue is fixed in version 2.0.0.

Affected products

JanssenProject jans: before 2.0.0

References

https://github.com/JanssenProject/jans/commit/0cdd214870ee30eb2186261f21c85b9e9fc63b5c
https://github.com/JanssenProject/jans/pull/13438
https://github.com/JanssenProject/jans/releases/tag/v2.0.0
https://github.com/JanssenProject/jans/security/advisories/GHSA-r3gj-4pj2-9j3j
https://github.com/JanssenProject/jans/security/advisories/GHSA-r3gj-4pj2-9j3j

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