{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53636","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-09T20:16:59.647Z","datePublished":"2026-09-02T16:54:10.403Z","dateUpdated":"2026-09-02T18:03:41.926Z"},"containers":{"cna":{"title":"Open edX LTI OAuth Replay Attack","problemTypes":[{"descriptions":[{"cweId":"CWE-294","lang":"en","description":"CWE-294: Authentication Bypass by Capture-replay","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p3h9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p3h9"},{"name":"https://github.com/openedx/openedx-platform/commit/0a92cf25de8844bf840ffd5d18dcfd940031a2ba","tags":["x_refsource_MISC"],"url":"https://github.com/openedx/openedx-platform/commit/0a92cf25de8844bf840ffd5d18dcfd940031a2ba"},{"name":"https://github.com/openedx/openedx-platform/commit/3a5ac856c79557c5c74d8b3e6578f289d7cceecd","tags":["x_refsource_MISC"],"url":"https://github.com/openedx/openedx-platform/commit/3a5ac856c79557c5c74d8b3e6578f289d7cceecd"},{"name":"https://github.com/openedx/openedx-platform/commit/50af17b05d82a8c7e8e690cc2783a8a0ba330bc3","tags":["x_refsource_MISC"],"url":"https://github.com/openedx/openedx-platform/commit/50af17b05d82a8c7e8e690cc2783a8a0ba330bc3"}],"affected":[{"vendor":"openedx","product":"openedx-platform","versions":[{"version":"< 3a5ac856c79557c5c74d8b3e6578f289d7cceecd","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-02T16:54:10.403Z"},"descriptions":[{"lang":"en","value":"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."}],"source":{"advisory":"GHSA-6gm5-c49g-p3h9","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p3h9","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-02T18:03:21.512059Z","id":"CVE-2026-53636","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-02T18:03:41.926Z"}}]}}