CVE-2026-54733
Published:July 16, 2026
Updated:August 04, 2026
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.
Affected Packages
https://github.com/microsoft/o365-moodle.git (GITHUB):
Affected version(s) >=v20260210_m501 <v20260423_m501Fix Suggestion:
Update to version v20260423_m501https://github.com/microsoft/o365-moodle.git (GITHUB):
Affected version(s) >=v20250929_m500 <v20260423_m500Fix Suggestion:
Update to version v20260423_m500https://github.com/microsoft/o365-moodle.git (GITHUB):
Affected version(s) >=v20241125_m405 <v20260423_m405Fix Suggestion:
Update to version v20260423_m405Related Resources (9)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.8
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Verification of Cryptographic Signature
EPSS
Base Score:
0.92