CVE-2026-56779 MaxKB < 2.10.0 - Server-Side Request Forgery via downloadCallbackUrl and download_url Parameters
Authenticated users can exploit unvalidated URL parameters in MaxKB to perform server-side request forgery and access internal network services.
- 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-2026-56779?
CVE-2026-56779 is a medium-severity server-side request forgery vulnerability in 1Panel-dev MaxKB, published on 25 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MaxKB before 2.10.0 contains a server-side request forgery vulnerability in tool creation and update endpoints that allows authenticated users to make arbitrary server requests by supplying unvalidated downloadCallbackUrl and download_url parameters. Attackers with default workspace USER role can exploit this to access internal network services by providing malicious URLs to the ToolSerializer endpoints.
Weakness: CWE-918
Which versions are affected by CVE-2026-56779?
How do I fix CVE-2026-56779?
No fix has been published for CVE-2026-56779 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-2026-56779 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-56779 exists.
Sources
Also known as GHSA-395g-c5fv-7hfh.