EUVD-2026-44938Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A04:2025 - Cryptographic Failures
ASVS 5.0
V11 - Cryptography Signature verification
|
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Alert meAnalysisAIv1 – Jul 16, 2026
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. There is no public exploit identified at time of analysis and it is not in CISA KEV, but the flaw is trivially exploitable and confirmed by a Microsoft GitHub security advisory (GHSA-hqjh-93qv-47v5).
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
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Severity 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
Primary rating from Vendor (GitHub_M) · only source for this CVE.
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
2DescriptionCVE.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.
Articles & Coverage 1
Executive ViewAI
A critical vulnerability in the Microsoft 365 integration plugin for Moodle allows unauthenticated attackers to forge authentication tokens and gain unauthorized access to any Office 365-linked user account. Moodle installations running versions prior to 4.5.6, 5.0.5, or 5.1.1 face immediate risk of unauthorized account takeover, unauthorized access to institutional data, and compliance violations.
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). Within 7 days, apply the vendor patch by upgrading affected Moodle instances to versions 4.5.6, 5.0.5, or 5.1.1 or later according to your current version line. Within 30 days, complete patch deployment across all Moodle systems and verify user authentication flows are functional through the updated Microsoft 365 plugin.
Vendor-released patch: Moodle 4.5.6, 5.0.5, and 5.1.1 or later. Pending patch deployment, immediately restrict network access to the sso_login.php endpoint via firewall rules and disable the Microsoft 365 SSO plugin if alternative authentication methods are available.
Threat Intelligence Overview
NVD
CVE.org
EPSS
Vulnrichment
GitHub
VulDB
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
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