CVE-2026-53636

MEDIUMPre-NVD 4.74.7—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.7 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 93% 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
Elevated
4.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.7Exploit: Elevated riskExposed: 0

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

Open edX Platform enables the authoring and delivery of online learning at any scale. Prior to commit 3a5ac85, a security vulnerability has been identified in the Open edX LMS platform's LTI (Learning Tools Interoperability) Provider implementation. The validate_timestamp_and_nonce function in lms/djangoapps/lti_provider/signature_validator.py does not validate OAuth nonces or timestamps, allowing an attacker who captures a valid LTI launch request to replay it an unlimited number of times without detection. This issue has been patched via commit 3a5ac85.

CVSS v3
4.7
EG Score
4.7(medium)
EG Risk
37(Track)
EG Risk 37/100SSVC: 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
Severity47% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

September 2, 2026

Last Modified

September 9, 2026

Advisory Details (4)

Auto-updated Sep 2, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github_commit

commit 50af17b05d82 (openedx/openedx-platform)

Fix landed in openedx/openedx-platform commit 50af17b05d82 — awaiting tagged release

https://github.com/openedx/openedx-platform/commit/50af17b05d82a8c7e8e690cc2783a8a0ba330bc3
github_commit

commit 3a5ac856c795 (openedx/openedx-platform)

Fix landed in openedx/openedx-platform commit 3a5ac856c795 — awaiting tagged release

https://github.com/openedx/openedx-platform/commit/3a5ac856c79557c5c74d8b3e6578f289d7cceecd
github_commit

commit 0a92cf25de88 (openedx/openedx-platform)

Fix landed in openedx/openedx-platform commit 0a92cf25de88 — awaiting tagged release

https://github.com/openedx/openedx-platform/commit/0a92cf25de8844bf840ffd5d18dcfd940031a2ba
github Patch Available🟡 PoC Available

Open edX LTI OAuth Replay Attack · Advisory · openedx/openedx-platform · GitHub

https://github.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p3h9

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 28× 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. 2026-09-19 08:56 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 07:38 UTCEG score recompute
  4. 2026-09-17 06:20 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 03:39 UTCEG score recompute
  8. 2026-09-14 02:21 UTCEG score recompute
  9. 2026-09-13 16:47 UTCEPSS rescore
  10. 2026-09-13 01:04 UTCEG score recompute
  11. 2026-09-11 23:46 UTCEG score recompute
  12. 2026-09-11 14:53 UTCEPSS rescore
  13. 2026-09-10 22:28 UTCEG score recompute
  14. 2026-09-10 09:35 UTCEPSS rescore
  15. 2026-09-09 03:30 UTCEG score recompute
  16. 2026-09-08 22:01 UTCEPSS rescore
  17. 2026-09-08 02:12 UTCEG score recompute
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-07 00:54 UTCEG score recompute
  20. 2026-09-06 13:47 UTCEPSS rescore
  21. 2026-09-05 23:32 UTCEG score recompute
  22. 2026-09-04 22:14 UTCEG score recompute
  23. 2026-09-04 05:06 UTCEPSS rescore
  24. 2026-09-02 19:31 UTCEG score recompute
  25. 2026-09-02 18:31 UTCEG score recompute
Show 3 more
  1. 2026-09-02 17:35 UTCEG score recompute
  2. 2026-09-02 16:58 UTCEG score recompute
  3. 2026-09-02 16:55 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-53636?
CVE-2026-53636 is a medium vulnerability published on September 2, 2026. Open edX Platform enables the authoring and delivery of online learning at any scale. Prior to commit 3a5ac85, a security vulnerability has been identified in the Open edX LMS platform's LTI (Learning Tools Interoperability) Provider implementation. The validatetimestampandnonce function in…
When was CVE-2026-53636 disclosed?
CVE-2026-53636 was first published in the National Vulnerability Database on September 2, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-53636 actively exploited?
CVE-2026-53636 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.9% of all scored CVEs.
What is the CVSS score of CVE-2026-53636?
CVE-2026-53636 has a CVSS v3 base score of 4.7 (NVD).
How do I remediate CVE-2026-53636?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-53636, 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-2026-53636

Explore →

Is Your Infrastructure Affected by CVE-2026-53636?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs