CVE-2026-55421 Details
Description
Open edX Platform enables the authoring and delivery of online learning at any scale. Prior to commit 00b7c3c, the endpoint accepts user-supplied files[].url, performs a server-side fetch using "requests.get(url, allow_redirects=True)". The fetched bytes are then returned inside a ZIP response. This enables SSRF with response exfiltration. Redirect-following is enabled, and there is no timeout in the vulnerable fetch path. This issue has been patched via commit 00b7c3c.
A server-side request forgery (SSRF) vulnerability has been identified in the Open edX Platform, specifically in the video download endpoint of the content store API. This issue affects versions of the platform starting from 'redwood' and prior to 'ulmo'. The vulnerability arises because the endpoint allows authenticated users with studio read access to upload URLs that are then fetched server-side without validation. This could be exploited to access internal services or cloud metadata endpoints, exfiltrating the responses back to the user. The vulnerability is exacerbated by the absence of a request timeout, allowing for potential resource consumption issues.
Users can update to Open edX Platform versions 'ulmo' or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 2, 2026CISA-ADP
Assessed Sep 4, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Open edX | >= redwood |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 4, 2026 | CVE Modified | CISA-ADP |
| Sep 2, 2026 | New CVE Received | [email protected] |