CVE-2026-31946 | OpenOlat up to 20.2.4 JWKS Endpoint JSONWebToken.parse improper authentication (GHSA-v8vp-x4q4-2vch)

VDB-354267 · CVE-2026-31946 · GHSA-V8VP-X4Q4-2VCH OPENOLAT UP TO 20.2.4 JWKS ENDPOINT JSONWEBTOKEN.PARSE IMPROPER AUTHENTICATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 8.4 $0-$5k 1.29 Summaryinfo A vulnerability marked as critical has been reported in OpenOlat up to 20.2.4. Affected by this issue is the function JSONWebToken.parse of the component JWKS Endpoint. Performing a manipulation results in improper authentication. This vulnerability is reported as CVE-2026-31946. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component. Detailsinfo A vulnerability classified as critical has been found in OpenOlat up to 20.2.4. This affects the function JSONWebToken.parse of the component JWKS Endpoint. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is: 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. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-31946 since 03/10/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. Upgrading to version 20.2.5 eliminates this vulnerability. Productinfo Name OpenOlat Version 20.2.0 20.2.1 20.2.2 20.2.3 20.2.4 Website Product: https://github.com/OpenOLAT/OpenOLAT/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 8.5 VulDB Meta Temp Score: 8.4 VulDB Base Score: 7.3 VulDB Temp Score: 7.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 9.8 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Improper authentication CWE: CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: OpenOlat 20.2.5 Timelineinfo 03/10/2026 CVE reserved 03/30/2026 +20 days VulDB entry created 03/31/2026 +0 days Advisory disclosed 03/31/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-v8vp-x4q4-2vch Status: Confirmed CVE: CVE-2026-31946 (🔒) GCVE (CVE): GCVE-0-2026-31946 GCVE (VulDB): GCVE-100-354267 Entryinfo Created: 03/31/2026 00:17 Changes: 03/31/2026 00:17 (65) Complete: 🔍 Cache ID: 99:EDF:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸