{"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"}}]}}

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