CVE-2026-18372 CSS injection in M-Files Web
An authenticated vault administrator can inject arbitrary CSS into M-Files Web, altering the user interface for other users.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-18372?
CVE-2026-18372 is a medium-severity cross-site scripting vulnerability in M-Files Web, published on 19 Aug 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
CSS injection vulnerability in M-Files Web before 26.8.16330.2 allows an authenticated vault administrator to inject arbitrary CSS, affecting the web user interface displayed to other vault users.
Weakness: CWE-79
Which versions are affected by CVE-2026-18372?
How do I fix CVE-2026-18372?
No fix has been published for CVE-2026-18372 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-18372 being exploited?
There is no known exploitation of CVE-2026-18372 in the wild and no public exploit code.
Sources
Also known as GHSA-2qm2-pcpp-5p89.