RCE in Stilleshan Serverstatus
CVE-2026-90502
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (26.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
- Stilleshan Serverstatus — versions 1.0, 2.0
Weakness classification (CWE)
References
- vuldb.com/vuln/403090 (technical-description, vdb-entry)
- vuldb.com/vuln/403090/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-90502 (third-party-advisory)
- vuldb.com/submit/895248 (third-party-advisory)
- github.com/BlkSword/POC/blob/main/ServerStatus Stored .pdf (exploit)
Frequently asked questions
- What is CVE-2026-90502?
- CVE-2026-90502 is a low-severity vulnerability in Stilleshan Serverstatus, classified under Cross-site Scripting. CVSS score: 3.5/10. Published 2026-09-13.
- How severe is CVE-2026-90502?
- Low severity. CVSS v3 base score is 3.5 out of 10.