PT-2026-29122 · Openolat · Openolat

Published 2026-03-30 · Updated 2026-03-30 · CVE-2026-31946

Mitre

CVSS v3.1

9.8

Critical

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Improper Verification of Cryptographic Signature

Improper Authentication

Weakness Enumeration

CWE-347

CWE-287

Related Identifiers

CVE-2026-31946

Affected Products

Openolat

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-31946 · Security Note
• https://github.com/OpenOLAT/OpenOLAT/security/advisories/GHSA-v8vp-x4q4-2vch · Note