CVE-2026-88593 Cross-site scripting in n/a
Reflected XSS in kkFileView allows attackers to execute arbitrary scripts in victim browsers via unsanitized parameters in the online preview endpoint.
- 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-2026-88593?
CVE-2026-88593 is a medium-severity cross-site scripting vulnerability in n/a, published on 16 Sep 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
kkFileView 5.0.0 through 5.0.2 allows reflected XSS via the /onlinePreview endpoint. The OnlinePreviewController passes the user-controlled page and kkagent request parameters to FreeMarker templates without sanitization, and the templates insert these values into raw JavaScript contexts.
Weakness: CWE-79
Which versions are affected by CVE-2026-88593?
How do I fix CVE-2026-88593?
No fix has been published for CVE-2026-88593 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-2026-88593 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-88593 exists.
Sources
Also known as GHSA-7g5g-h785-2px7.