CVE-2026-90502 stilleshan ServerStatus Stats Generation main.cpp cross site scripting
Remote attackers can inject malicious scripts via the custom argument in ServerStatus stats generation, potentially compromising user sessions.
- 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-2026-90502?
CVE-2026-90502 is a medium-severity cross-site scripting vulnerability in stilleshan ServerStatus, published on 13 Sep 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
A vulnerability was detected in stilleshan ServerStatus 1.0/2.0. Impacted is an unknown function of the file server/src/main.cpp of the component Stats Generation. Performing a manipulation of the argument custom results in cross site scripting. It is possible to initiate the attack remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-90502?
How do I fix CVE-2026-90502?
No fix has been published for CVE-2026-90502 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-2026-90502 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-90502 exists.
Sources
Also known as GHSA-whhh-5jcc-5rrv.