Cacti: Session Fixation via missing session_regenerate_id() after login

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.

Scores

EPSS (exploitation in 30 days)

0.32% · top 75% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.4.

Weakness

• CWE-384: Session Fixation (opens in a new tab)All about CWE-384 and its CVEs

Affected products

• Cacti · cacti

  • affected < 1.2.31

References (3)

• https://github.com/Cacti/cacti/security/advisories/GHSA-273r-qr93-wgcp (opens in a new tab)x_refsource_CONFIRM
• https://github.com/Cacti/cacti/commit/2fa404e70a5702be10682555911228e8e51ba198 (opens in a new tab)x_refsource_MISC
• https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31 (opens in a new tab)x_refsource_MISC

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-40082](https://trackcve.app/badge/CVE-2026-40082.svg)](https://trackcve.app/cve/CVE-2026-40082)

Record last updated 26 Jun 2026, 18:42 UTC.