Vulnerability Description
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 Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/openedx/openedx-platform/commit/0a92cf25de8844bf840ffd5d18dcf
- https://github.com/openedx/openedx-platform/commit/3a5ac856c79557c5c74d8b3e6578f
- https://github.com/openedx/openedx-platform/commit/50af17b05d82a8c7e8e690cc2783a
- https://github.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p
- https://github.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p
FAQ
What is CVE-2026-53636?
CVE-2026-53636 is a vulnerability with a CVSS score of 4.7 (MEDIUM). 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...
How severe is CVE-2026-53636?
CVE-2026-53636 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-53636?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.