Vulnerability · Published Jul 16, 2026 · Assigned by GitHub_M

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

Medium 5.3

In plain English

A medium-severity security flaw in jans from JanssenProject. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.2%top 90.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
JanssenProject	jans	< 2.0.0

Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

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