CVE-2026-18371 HTML injection in M-Files Web
An authenticated attacker can inject HTML into the M-Files Web interface, affecting content displayed to other users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-18371?
CVE-2026-18371 is a medium-severity cross-site scripting vulnerability in M-Files Web, published on 19 Aug 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
HTML injection vulnerability in M-Files Web before 26.8.16330.2 allows an authenticated attacker to affect web user interface contents displayed to other users.
Weakness: CWE-79
Which versions are affected by CVE-2026-18371?
How do I fix CVE-2026-18371?
No fix has been published for CVE-2026-18371 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-2026-18371 being exploited?
There is no known exploitation of CVE-2026-18371 in the wild and no public exploit code.
Sources
Also known as GHSA-h853-8cgc-4pxc.