XSS in Cacti
CVE-2026-39900
Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Reflected XSS via tab parameter in the auth_profile.php JavaScript context. This issue has been fixed in version 1.2.31.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (16.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.3% 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
- Cacti — versions < 1.2.31
Weakness classification (CWE)
References
- github.com/Cacti/cacti/security/advisories/GHSA-34rf-frc3-v48r (Patch, Vendor Advisory)
- github.com/Cacti/cacti/commit/891344a5c10b8687a3d2a5d26e6de20f13069e2a (Patch)
Frequently asked questions
- What is CVE-2026-39900?
- CVE-2026-39900 is a medium-severity vulnerability in Cacti, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-24.
- How severe is CVE-2026-39900?
- Medium severity. CVSS v3 base score is 6.1 out of 10.