CVE-2026-55421 Open edX Platform: SSRF in Studio Video Download Endpoint
Attackers can exploit a Server-Side Request Forgery vulnerability in the Studio Video Download endpoint to fetch internal resources and exfiltrate data.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-55421?
CVE-2026-55421 is a medium-severity server-side request forgery vulnerability in openedx-platform, published on 2 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-55421?
How do I fix CVE-2026-55421?
No fix has been published for CVE-2026-55421 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-55421 being exploited?
There is no known exploitation of CVE-2026-55421 in the wild and no public exploit code.
Sources
Also known as GHSA-fpf9-9rpr-jvrx.