CVE-2026-53636: CWE-294: Authentication Bypass by Capture-replay in openedx openedx-platform
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.
CVSS v3.1
Score 4.7medium
Affected software
openedx
openedx-platform
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-53636 is an authentication bypass vulnerability in the Open edX platform's LTI Provider. The validate_timestamp_and_nonce function in lms/djangoapps/lti_provider/signature_validator.py did not properly validate OAuth nonces or timestamps, enabling attackers to replay valid LTI launch requests indefinitely. This flaw was addressed and patched in commit 3a5ac85.
Potential Impact
An attacker who captures a valid LTI launch request can replay it multiple times, bypassing authentication mechanisms. This may lead to unauthorized access or actions within the Open edX LMS platform. The CVSS score of 4.7 reflects a medium severity with limited confidentiality and integrity impact and no availability impact.
Mitigation Recommendations
A patch addressing this vulnerability has been committed (commit 3a5ac85). Users of the Open edX platform should apply this update to ensure proper validation of OAuth nonces and timestamps and prevent replay attacks. Patch status is not explicitly confirmed beyond the commit reference; check the vendor repository for the official patch and update instructions.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-09T20:16:59.647Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a9857eeacd9273b497f3ca9
Added to database: 09/02/2026, 17:07:58 UTC
Last enriched: 09/07/2026, 13:32:34 UTC
Last updated: 10/17/2026, 18:48:20 UTC
Views: 85
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