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.
References5
- github.com/openedx/openedx-platform/commit/0a92cf25de8844bf840f…
- github.com/openedx/openedx-platform/commit/3a5ac856c79557c5c74d…
- github.com/openedx/openedx-platform/commit/50af17b05d82a8c7e8e6…
- github.com/openedx/openedx-platform/security/advisories/GHSA-6g…
- github.com/openedx/openedx-platform/security/advisories/GHSA-6g…
Metrics
- CVSS 3.1
-
4.7
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 21 · as of 3 November 2026
- CWE
- CWE-294
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.