CVE-2026-536364.7MediumCWE-294

CVE-2026-53636: Open edX LTI OAuth Replay Attack

openedx · openedx-platform

Affected: openedx-platform · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.3%probability of exploitation in the next 30 days

20th percentile

050100

Higher than 20% of scored CVEs

4.7MediumCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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.

Affected products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

openedx · openedx-platform< 3a5ac856c79557c5c74d8b3e6578f289d7cceecd

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Authentication Bypass by Capture-replay · Authentication
Vendor: openedx
Published: September 2026
Band: Unlikely (under 1%), September 2026

CoverageNo articles yet

No CyberSIXT article names CVE-2026-53636 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.