{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0a92cf25de8844bf840ffd5d18dcfd940031a2ba"
            },
            {
              "fixed": "3a5ac856c79557c5c74d8b3e6578f289d7cceecd"
            },
            {
              "fixed": "50af17b05d82a8c7e8e690cc2783a8a0ba330bc3"
            }
          ],
          "repo": "https://github.com/openedx/openedx-platform",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-6gm5-c49g-p3h9"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-294"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53636.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "3a5ac856c79557c5c74d8b3e6578f289d7cceecd"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "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.",
  "id": "CVE-2026-53636",
  "modified": "2026-09-04T03:30:18.136962375Z",
  "published": "2026-09-02T16:54:10.403Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53636.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p3h9"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53636"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openedx/openedx-platform/commit/0a92cf25de8844bf840ffd5d18dcfd940031a2ba"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openedx/openedx-platform/commit/3a5ac856c79557c5c74d8b3e6578f289d7cceecd"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openedx/openedx-platform/commit/50af17b05d82a8c7e8e690cc2783a8a0ba330bc3"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Open edX LTI OAuth Replay Attack"
}