Is CVE-2026-53636 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-53636?

CVE-2026-53636 has a CVSS v3 severity of MEDIUM (4.7).

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CVE-2026-53636

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.