CVEvulnerability

CVE-2026-31946

9.8 CRITICAL Published 2026-03-30 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-03-30
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-287, CWE-347

Description

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.

Affected configurations

• frentix openolat (>= 10.5.4 < 20.2.5)

Related

Weakness · CWE (2)

  • CWE-287 Improper Authentication weakness
  • CWE-347 Improper Verification of Cryptographic Signature weakness

References