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CVE-2026-53636

4.7 · MEDIUM

Open edX Platform enables the authoring and delivery of online learning at any scale.

Published Sep 2, 2026CWE-294EPSS 0.28%

Overview

CVE-2026-53636 is a medium-severity vulnerability. It was published on September 2, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/openedx/openedx-platform/commit/0a92cf25de8844bf840ffd5d18dcfd940031a2baGitHubgithub.com/openedx/openedx-platform/commit/3a5ac856c79557c5c74d8b3e6578f289d7cceecdGitHubgithub.com/openedx/openedx-platform/commit/50af17b05d82a8c7e8e690cc2783a8a0ba330bc3GitHubgithub.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p3h9GitHubgithub.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p3h9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53636?

CVE-2026-53636 is a medium-severity vulnerability. It was published on September 2, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2026-53636?

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-53636?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53636?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53636 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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