VULNERABILITY INTELLIGENCE
CVE-2026-53636
CVSS score4.7 MEDIUM
EPSS probability0.28%
CISA KEVNot currently listed
Published2026-09-02
Last modified2026-09-09
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Description
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.
Weakness classification
- security-advisories@github.com: CWE-294