Vulnerability · Published Jun 25, 2026 · Assigned by GitHub_M
CVE-2026-40082Cacti: Session Fixation via missing session_regenerate_id() after login
Medium 5.4
In plain English
A medium-severity session fixation in cacti from Cacti. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 25% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | cacti | no fix listed | DEBIAN-CVE-2026-40082 |
| Debian:13 | cacti | no fix listed | DEBIAN-CVE-2026-40082 |
| Debian:14 | cacti | 1.2.31+ds1-1 | DEBIAN-CVE-2026-40082 |
| Ubuntu:24.04:LTS | cacti | no fix listed | UBUNTU-CVE-2026-40082 |
| Ubuntu:25.10 | cacti | no fix listed | UBUNTU-CVE-2026-40082 |
| Ubuntu:26.04:LTS | cacti | no fix listed | UBUNTU-CVE-2026-40082 |
| Ubuntu:26.10 | cacti | no fix listed | UBUNTU-CVE-2026-40082 |
Affected products (as reported)
Weakness: CWE-384 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
References
- https://github.com/Cacti/cacti/security/advisories/GHSA-273r-qr93-wgcp x_refsource_CONFIRM
- https://github.com/Cacti/cacti/commit/2fa404e70a5702be10682555911228e8e51ba198 x_refsource_MISC
- https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31 x_refsource_MISC