---
id: CVE-2026-53636
title: >-
  Open edX Platform enables the authoring and delivery of online learning at any
  scale
summary: >-
  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
  imp…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-294
published: '2026-09-02'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:04:42.813'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53636'
references:
  - url: >-
      https://github.com/openedx/openedx-platform/commit/0a92cf25de8844bf840ffd5d18dcfd940031a2ba
    label: security-advisories@github.com
  - url: >-
      https://github.com/openedx/openedx-platform/commit/3a5ac856c79557c5c74d8b3e6578f289d7cceecd
    label: security-advisories@github.com
  - url: >-
      https://github.com/openedx/openedx-platform/commit/50af17b05d82a8c7e8e690cc2783a8a0ba330bc3
    label: security-advisories@github.com
  - url: >-
      https://github.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p3h9
    label: security-advisories@github.com
  - url: >-
      https://github.com/openedx/openedx-platform/security/advisories/GHSA-6gm5-c49g-p3h9
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.0028
epssPercentile: 0.18267
ingestedAt: '2026-09-09T21:22:45.563Z'
---

## Overview

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

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.