CVE-2026-56399 Open WebUI - Server-Side Request Forgery via Location Redirect in /api/v1/retrieval/process/web
Authenticated attackers can bypass SSRF protections in Open WebUI to access internal services and potentially execute commands via instance secrets.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-56399?
CVE-2026-56399 is a medium-severity server-side request forgery vulnerability in open-webui, published on 30 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Open WebUI before 0.6.27 contains a server-side request forgery vulnerability in the /api/v1/retrieval/process/web endpoint that allows authenticated users to bypass SSRF protections. Attackers can manipulate URL parameters with location redirect headers to access internal services and potentially execute commands via instance secrets.
Weakness: CWE-918
Which versions are affected by CVE-2026-56399?
How do I fix CVE-2026-56399?
No fix has been published for CVE-2026-56399 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-2026-56399 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56399 exists.
Sources
Also known as GHSA-82r6-c5jm-f3mw, GHSA-v376-5ppg-xp5v.