Vulnerability in Cacti
CVE-2026-40082
Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have missing session_regenerate_id() after login, leading to Session Fixation. session_regenerate_id() is NOT called after successful login. The login flow at auth_login.php:203-207 directly sets $_SESSION[SESS_USER_ID] without rotating the session ID. The session cookie configuration is otherwise good (httponly=true, samesite=Strict, secure=true for HTTPS at include/global.php:513-537), but these do not prevent session fixation via same-site vectors. This issue has been fixed in version 1.2.31.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.5% 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/commit/2fa404e70a5702be10682555911228e8e51ba198 (Patch)
- github.com/Cacti/cacti/releases/tag/release/1.2.31 (Product, Release Notes)
- github.com/Cacti/cacti/security/advisories/GHSA-273r-qr93-wgcp (Exploit, Mitigation, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-40082?
- CVE-2026-40082 is a medium-severity vulnerability in Cacti, classified under Session Fixation. CVSS score: 5.4/10. Published 2026-06-25.
- How severe is CVE-2026-40082?
- Medium severity. CVSS v3 base score is 5.4 out of 10.