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 43% 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
9.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

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 computed
Severity93% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
57%
KEV
Not listed

Published

July 16, 2026

Last Modified

July 16, 2026

Advisory Details (7)

Auto-updated Sep 3, 2026
Patch available. Sources: github_commit, github_release, github.
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-47v5
github_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_m501
github_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_m500
github_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_m405
github_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/d5596655f0baaee0f11aec2e10d6f36b0bd29220
github_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/258872f6e2011f4efa8ebb77d2898142a9435e89
github_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/01b2d4c2e13b06a66557527084cbf9bace655944

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 43× 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.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-10 09:35 UTCEPSS rescore
  3. 2026-09-08 22:01 UTCEPSS rescore
  4. 2026-09-08 00:30 UTCEG score recompute
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-06 17:41 UTCEG score recompute
  7. 2026-09-06 13:47 UTCEPSS rescore
  8. 2026-09-05 20:39 UTCEG score recompute
  9. 2026-09-04 05:06 UTCEPSS rescore
  10. 2026-09-02 14:12 UTCEPSS rescore
  11. 2026-09-01 13:54 UTCEPSS rescore
  12. 2026-09-01 04:40 UTCEPSS rescore
  13. 2026-08-30 20:40 UTCEG score recompute
  14. 2026-08-30 19:17 UTCEPSS rescore
  15. 2026-08-30 03:35 UTCEG score recompute
  16. 2026-08-30 01:22 UTCEPSS rescore
  17. 2026-08-28 21:41 UTCEPSS rescore
  18. 2026-08-27 21:27 UTCEG score recompute
  19. 2026-08-27 14:25 UTCEPSS rescore
  20. 2026-08-26 22:52 UTCEG score recompute
  21. 2026-08-26 14:46 UTCEPSS rescore
  22. 2026-08-25 16:20 UTCEG score recompute
  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-24 19:21 UTCEG score recompute
  25. 2026-08-24 09:28 UTCEG score recompute
Show 65 more
  1. 2026-08-23 04:06 UTCEG score recompute
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-22 02:54 UTCEG score recompute
  4. 2026-08-21 23:49 UTCEPSS rescore
  5. 2026-08-21 01:16 UTCEG score recompute
  6. 2026-08-20 22:55 UTCEPSS rescore
  7. 2026-08-19 23:55 UTCEG score recompute
  8. 2026-08-19 17:04 UTCEPSS rescore
  9. 2026-08-18 19:56 UTCEG score recompute
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-16 15:32 UTCEG score recompute
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 02:58 UTCEG score recompute
  14. 2026-08-16 02:14 UTCEPSS rescore
  15. 2026-08-15 01:47 UTCEG score recompute
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 00:31 UTCEG score recompute
  18. 2026-08-13 22:00 UTCEPSS rescore
  19. 2026-08-12 14:58 UTCEG score recompute
  20. 2026-08-12 13:51 UTCEPSS rescore
  21. 2026-08-11 17:54 UTCEG score recompute
  22. 2026-08-11 01:08 UTCEG score recompute
  23. 2026-08-11 00:00 UTCEPSS rescore
  24. 2026-08-09 15:25 UTCEG score recompute
  25. 2026-08-09 13:46 UTCEPSS rescore
  26. 2026-08-08 18:28 UTCEG score recompute
  27. 2026-08-08 16:37 UTCEPSS rescore
  28. 2026-08-07 17:18 UTCEG score recompute
  29. 2026-08-06 16:09 UTCEG score recompute
  30. 2026-08-06 13:47 UTCEPSS rescore
  31. 2026-08-05 23:23 UTCEG score recompute
  32. 2026-08-05 19:17 UTCEPSS rescore
  33. 2026-08-04 17:21 UTCEG score recompute
  34. 2026-08-04 15:10 UTCEPSS rescore
  35. 2026-08-04 13:09 UTCEG score recompute
  36. 2026-08-04 10:39 UTCEPSS rescore
  37. 2026-08-03 11:58 UTCEG score recompute
  38. 2026-08-03 10:36 UTCEPSS rescore
  39. 2026-08-02 05:48 UTCEG score recompute
  40. 2026-08-02 02:27 UTCEPSS rescore
  41. 2026-08-01 04:37 UTCEG score recompute
  42. 2026-08-01 04:16 UTCEPSS rescore
  43. 2026-07-30 18:59 UTCEG score recompute
  44. 2026-07-30 16:28 UTCEPSS rescore
  45. 2026-07-30 09:38 UTCEG score recompute
  46. 2026-07-30 05:27 UTCEG score recompute
  47. 2026-07-30 01:30 UTCEPSS rescore
  48. 2026-07-28 18:09 UTCEG score recompute
  49. 2026-07-28 15:37 UTCEPSS rescore
  50. 2026-07-26 15:37 UTCEG score recompute
  51. 2026-07-26 14:54 UTCEPSS rescore
  52. 2026-07-26 11:25 UTCEG score recompute
  53. 2026-07-25 14:18 UTCEPSS rescore
  54. 2026-07-24 14:18 UTCEPSS rescore
  55. 2026-07-23 14:18 UTCEPSS rescore
  56. 2026-07-23 03:19 UTCEG score recompute
  57. 2026-07-22 14:08 UTCEPSS rescore
  58. 2026-07-21 15:25 UTCEPSS rescore
  59. 2026-07-20 17:08 UTCEPSS rescore
  60. 2026-07-19 14:31 UTCEPSS rescore
  61. 2026-07-19 14:31 UTCEPSS rescore
  62. 2026-07-19 02:29 UTCEPSS rescore
  63. 2026-07-18 10:04 UTCEPSS rescore
  64. 2026-07-16 15:24 UTCEG score recompute
  65. 2026-07-16 15:23 UTCMITRE cvelistV5first tracked

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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 1% probability of exploitation in the next 30 days, which ranks it in the top 43.1% of all scored CVEs.
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.

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