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CVE-2026-54733— moodle-local_o365: Authentication bypass via unverified JWT signature in Teams SSO endpoint

Quick assessment

Affected
microsoft o365-moodle
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft o365-moodle是美国Microsoft公司开源的一款插件套件，旨在将 Microsoft 365 及 Azure Active Directory 服务深度集成至 Moodle 学习管理系统中。 Microsoft o365-moodle 4.5.6之前版本、5.0.5之前版本和5.1.1之前版本存在加密问题漏洞，该漏洞源于Office 365 Integration plugin的sso_login.php端点base64解码JWT有效载荷并基于upn声明验证用户时未验证JW

AI Predicted 9.8 Difficulty: Easy EPSS 0.88% · P57

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
microsoft o365-moodle < 4.5.6 affected
>= 5.0.0, < 5.0.5 affected
>= 5.1.0, < 5.1.1 affected
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I. Basic Information for CVE-2026-54733

Vulnerability Information
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Vulnerability Title
moodle-local_o365: Authentication bypass via unverified JWT signature in Teams SSO endpoint
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft o365-moodle 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft o365-moodle是美国Microsoft公司开源的一款插件套件，旨在将 Microsoft 365 及 Azure Active Directory 服务深度集成至 Moodle 学习管理系统中。 Microsoft o365-moodle 4.5.6之前版本、5.0.5之前版本和5.1.1之前版本存在加密问题漏洞，该漏洞源于Office 365 Integration plugin的sso_login.php端点base64解码JWT有效载荷并基于upn声明验证用户时未验证JW
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
microsoft o365-moodle < 4.5.6 -

II. Public POCs for CVE-2026-54733

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III. Intelligence Information for CVE-2026-54733

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Patches & Fixes for CVE-2026-54733 (3)

Vendor Advisories for CVE-2026-54733 (1)

Vendor Pages for CVE-2026-54733 (2)

Same Patch Batch · microsoft · 2026-07-16 · 20 CVEs total

CVE-2026-59866 9.3 CRITICAL Kiota: Arbitrary file write + code-injection via x-ms-kiota-info clientClassName and clien
CVE-2026-59864 9.3 CRITICAL Kiota: Path/URL injection into generated Copilot plugin manifest via x-ai-* extensions
CVE-2026-59865 9.3 CRITICAL Kiota: Command injection via x-ms-kiota-info dependencyInstallCommand surfaced by `kiota i
CVE-2026-59860 8.7 HIGH Kiota: XML Doc-Comment Newline Breakout Code Injection
CVE-2026-59859 8.7 HIGH Kiota: Code Generation Literal Injection in the PHP Generator
CVE-2026-57206 8.6 HIGH SimpleChat plugin validation endpoints missing authentication and authorization
CVE-2026-59117 7.5 HIGH Windows Terminal Remote Code Execution Vulnerability
CVE-2026-59861 7.5 HIGH Kiota: Code Generation Literal Injection in Kiota Ruby Generator
CVE-2026-59862 7.5 HIGH Kiota: Code Generation Literal Injection in the Python Generator
CVE-2026-53598 7.5 HIGH Prompty: Arbitrary File Read via ${file:path} Reference Expansion
CVE-2026-59867 7.1 HIGH Kiota: Generation-time SSRF + remote/local file inclusion via unrestricted $ref
CVE-2026-58598 7.0 HIGH Windows Backup Service Elevation of Privilege Vulnerability
CVE-2026-59863 7.0 HIGH Kiota: Workspace-config poisoning: out-of-repo file write + generation-time SSRF
CVE-2026-55440 6.5 MEDIUM Microsoft UFO: COMMAND_RESULTS handler creates unowned sessions, allowing authenticated se
CVE-2026-58643 6.1 MEDIUM Windows Admin Center Spoofing Vulnerability
CVE-2026-62826 4.6 MEDIUM Microsoft SharePoint Server Spoofing Vulnerability
CVE-2026-57205 4.3 MEDIUM SimpleChat: Authenticated users can access other users' profile metadata through user IDOR
CVE-2026-54568 4.3 MEDIUM Microsoft UFO: Missing Authorization in DEVICE_INFO_REQUEST Allows a DEVICE Client to Read
CVE-2026-53597 Prompty: Arbitrary code execution via JavaScript frontmatter in TypeScript loader

IV. Related Vulnerabilities

Same vendor: microsoft
Same weakness: CWE-347

V. Comments for CVE-2026-54733

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