Vulnerability Description
The Microsoft 365 and Microsoft Entra ID Plugins for Moodle provide Office 365 and Azure Active Directory integration for Moodle. Prior to 4.5.6, 5.0.5, and 5.1.1, the Microsoft Office 365 Integration plugin local_o365 Teams SSO endpoint sso_login.php base64-decodes a JWT payload and authenticates users from the upn claim without verifying the JWT signature, allowing an unauthenticated attacker to forge a token and obtain a Moodle session as an O365-authenticated user. This issue is fixed in versions 4.5.6, 5.0.5, and 5.1.1.
Related Weaknesses (CWE)
References
- https://github.com/microsoft/o365-moodle/commit/01b2d4c2e13b06a66557527084cbf9ba
- https://github.com/microsoft/o365-moodle/commit/258872f6e2011f4efa8ebb77d2898142
- https://github.com/microsoft/o365-moodle/commit/d5596655f0baaee0f11aec2e10d6f36b
- https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m405
- https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m500
- https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m501
- https://github.com/microsoft/o365-moodle/security/advisories/GHSA-hqjh-93qv-47v5
FAQ
What is CVE-2026-54733?
CVE-2026-54733 is a documented vulnerability. The Microsoft 365 and Microsoft Entra ID Plugins for Moodle provide Office 365 and Azure Active Directory integration for Moodle. Prior to 4.5.6, 5.0.5, and 5.1.1, the Microsoft Office 365 Integration...
How severe is CVE-2026-54733?
CVSS scoring is not yet available for CVE-2026-54733. Check NVD for updates.
Is there a patch for CVE-2026-54733?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.