Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-31946

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 11.4%
CVSS Severity
CVSS v3 Score 9.8
Products affected by CVE-2026-31946


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