EUVD-2026-44938Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from Vendor (GitHub_M) · only source for this CVE.
CVSS VectorVendor: GitHub_M
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
4DescriptionCVE.org
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.
AnalysisAI
Authentication bypass in the Microsoft 365 / Microsoft Entra ID (local_o365) plugin for Moodle allows an unauthenticated attacker to forge a JWT and log in as any Office 365-linked Moodle user before versions 4.5.6, 5.0.5, and 5.1.1. The Teams SSO endpoint sso_login.php base64-decodes the JWT payload and trusts the 'upn' claim without verifying the token signature, so a self-signed or hand-crafted token is accepted as valid. …
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Recommended ActionAI
Within 24 hours, identify all Moodle deployments running the local_o365 (Microsoft 365/Entra ID) plugin and determine which are running affected versions (Moodle 4.5.5 and earlier, 5.0.4 and earlier, or 5.1.0 and earlier). …
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