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TI-2026-24492 Aliases CVE-2026-31946

OpenOLAT: Authentication bypass via forged JWT in OIDC implicit flow

Priority MEDIUM 48CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0021 11th percentileScored 2026-11-07
Fix Fixed OpenOLAT (OpenOLAT): 20.2.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenOLATOpenOLAT10.5.4 to before 20.2.520.2.5Patch availableCNA
  • OpenOLAT VendorOpenOLAT Affected 10.5.4 to before 20.2.5 Fixed in 20.2.5 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:frentix:openolat:*:*:*:*:*:*:*:*10.5.4 to before 20.2.5VulnerableOpenOLAT
  • cpe:2.3:a:frentix:openolat:*:*:*:*:*:*:*:* Versions 10.5.4 to before 20.2.5 Vulnerable ·OpenOLAT

Remediation

  • Fix · CNA OpenOLAT (OpenOLAT) Fixed in 20.2.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-31946

References

Advisory 1

  • TI-2024-17072 Stored Cross-Site Scripting (XSS) within the Media Center CVSS 3.1MEDIUM 5.4
  • TI-2021-16566 Path Traversal in Archive Handling Leading to Code Execution CVSS 3.1HIGH 8.8
  • TI-2021-16567 Unsafe Deserialization of User Data Using XStream CVSS 3.1HIGH 8.8
  • TI-2026-22563 OpenOLAT: Server-Side Template Injection (SSTI) in Velocity templates allows Remote Code Execution CVSS 3.1HIGH 8.8
  • TI-2021-18077 Path Traversal in some REST methods leading to file upload to arbitrary places CVSS 3.1HIGH 8.1
  • TI-2021-17991 Path Traversal in Folder Component Leading to Local File Inclusion CVSS 3.1HIGH 7.7
See all 8 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences