CVE-2026-53636
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 4.7
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS probability
- 0.17%
- CWE
- CWE-294
- Published
- 2026-09-02
- Last modified
- 2026-09-02
Affected products
- openedx openedx-platform
Weakness type
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