{"id":"CVE-2026-53636","title":"Open edX Platform enables the authoring and delivery of online learning at any scale","summary":"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 imp…","severity":"medium","cvss":4.7,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","cwe":["CWE-294"],"published":"2026-09-02","updated":"2026-09-09","sourceUpdated":"2026-09-09T21:04:42.813","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-53636","references":[{"url":"https://github.com/openedx/openedx-platform/commit/0a92cf25de8844bf840ffd5d18dcfd940031a2ba","label":"security-advisories@github.com"},{"url":"https://github.com/openedx/openedx-platform/commit/3a5ac856c79557c5c74d8b3e6578f289d7cceecd","label":"security-advisories@github.com"},{"url":"https://github.com/openedx/openedx-platform/commit/50af17b05d82a8c7e8e690cc2783a8a0ba330bc3","label":"security-advisories@github.com"},{"url":"https://github.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p3h9","label":"security-advisories@github.com"},{"url":"https://github.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p3h9","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00173,"epssPercentile":0.07048,"ingestedAt":"2026-09-09T21:22:45.563Z","slug":"CVE-2026-53636","body":"## Overview\n\nOpen 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":25.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}