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.
CVE-2026-54733
CRITICALPre-NVD 9.39.3—
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.9%, top 44% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, secondary
9.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.3Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.3
- EG Score
- 9.3(medium)
- EG Risk
- 57(Track)EG Risk 57/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity93% × 45%Exploitation1% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS
- 56.4%
- KEV
- Not listed
Published
July 16, 2026
Last Modified
July 16, 2026
Advisory Details (7)
Auto-updated Jul 16, 2026Patch available. Sources: github_release, github, github_commit.
github Patch Available
Authentication bypass via unverified JWT signature in Teams SSO endpoint (local_o365) · Advisory · microsoft/o365-moodle · GitHub
https://github.com/microsoft/o365-moodle/security/advisories/GHSA-hqjh-93qv-47v5github_release Patch Available
Release 5.1.1 of Microsoft plugins for Moodle 5.1
Patch available: microsoft/o365-moodle v20260423_m501
https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m501github_release Patch Available
Release 5.0.5 of Microsoft plugins for Moodle 5.0
Patch available: microsoft/o365-moodle v20260423_m500
https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m500github_release Patch Available
Release 4.5.6 of Microsoft plugins for Moodle 4.5
Patch available: microsoft/o365-moodle v20260423_m405
https://github.com/microsoft/o365-moodle/releases/tag/v20260423_m405github_commit Patch Available
commit d5596655f0ba (microsoft/o365-moodle)
Patch available: microsoft/o365-moodle v20260423_m501 (contains commit d5596655f0ba)
https://github.com/microsoft/o365-moodle/commit/d5596655f0baaee0f11aec2e10d6f36b0bd29220github_commit Patch Available
commit 258872f6e201 (microsoft/o365-moodle)
Patch available: microsoft/o365-moodle v20260423_m500 (contains commit 258872f6e201)
https://github.com/microsoft/o365-moodle/commit/258872f6e2011f4efa8ebb77d2898142a9435e89github_commit Patch Available
commit 01b2d4c2e13b (microsoft/o365-moodle)
Patch available: microsoft/o365-moodle v20260423_m405 (contains commit 01b2d4c2e13b)
https://github.com/microsoft/o365-moodle/commit/01b2d4c2e13b06a66557527084cbf9bace655944Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 11× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-23 14:18 UTCEPSS rescore
- 2026-07-23 03:19 UTCEG score recompute
- 2026-07-22 14:08 UTCEPSS rescore
- 2026-07-21 15:25 UTCEPSS rescore
- 2026-07-20 17:08 UTCEPSS rescore
- 2026-07-19 14:31 UTCEPSS rescore
- 2026-07-19 14:31 UTCEPSS rescore
- 2026-07-19 02:29 UTCEPSS rescore
- 2026-07-18 10:04 UTCEPSS rescore
- 2026-07-16 15:24 UTCEG score recompute
- 2026-07-16 15:23 UTCMITRE cvelistV5first tracked
Related CVEs(same CWE)
Same CWE
10 shownCWE-347
Frequently asked(5)
What is CVE-2026-54733?
CVE-2026-54733 is a critical vulnerability published on July 16, 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 localo365 Teams SSO endpoint ssologin.php base64-decodes a JWT payload and authenticates…
When was CVE-2026-54733 disclosed?
CVE-2026-54733 was first published in the National Vulnerability Database on July 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54733 actively exploited?
CVE-2026-54733 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 56.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-54733?
CVE-2026-54733 has a CVSS v3 base score of 9.3 (NVD).
How do I remediate CVE-2026-54733?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54733, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-54733
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