PT-2026-60486 · Microsoft · O365-Moodle

CVE-2026-54733 · Published 2026-07-16 · Updated 2026-07-16

Mitre

CVSS v4.0

9.3

Critical

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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.

Fix

Improper Verification of Cryptographic Signature

Weakness Enumeration

CWE-347

Related Identifiers

CVE-2026-54733

Affected Products

O365-Moodle

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-54733 · Security Note
• https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m405 · Note
• https://github.com/microsoft/o365-moodle/commit/01b2d4c2e13b06a66557527084cbf9bace655944 · Note
• https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m500 · Note
• https://github.com/microsoft/o365-moodle/commit/d5596655f0baaee0f11aec2e10d6f36b0bd29220 · Note
• https://github.com/microsoft/o365-moodle/security/advisories/GHSA-hqjh-93qv-47v5 · Note
• https://github.com/microsoft/o365-moodle/commit/258872f6e2011f4efa8ebb77d2898142a9435e89 · Note
• https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m501 · Note