CVE-2026-9191 Insufficient isolation of user-supplied code in Progress MarkLogic Server
Attackers can execute unauthorized code via REST/XDBC paths, compromising sessions and performing actions in MarkLogic Server.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-9191?
CVE-2026-9191 is a critical code injection vulnerability in Progress Software Corporation MarkLogic Server, published on 12 Oct 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
Progress MarkLogic Server 12.x releases before 12.1.0 and 11.x releases before 11.3.7 do not sufficiently isolate user-supplied code executed through certain REST and XDBC evaluation paths from HTTP request, response, and session state. An attacker able to execute code through an affected path could perform unauthorized actions or compromise an authenticated session.
Weakness: CWE-346
Which versions are affected by CVE-2026-9191?
How do I fix CVE-2026-9191?
No fix has been published for CVE-2026-9191 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-9191 being exploited?
There is no known exploitation of CVE-2026-9191 in the wild and no public exploit code.
Sources
Also known as GHSA-gr4w-j394-9q4x.