What’s Vulnerable › Vulnerabilities

CVE-2026-40082: Cacti: Session Fixation via missing session_regenerate_id() after login

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-25 · updated 2026-06-29
• Weakness: CWE-384

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 products

• cacti: before 1.2.31 — fixed in 1.2.31

How to fix

Upgrade to a fixed version: cacti 1.2.31. Check the vendor advisory for mitigations.

References

• https://github.com/Cacti/cacti/commit/2fa404e70a5702be10682555911228e8e51ba198
• https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31
• https://github.com/Cacti/cacti/security/advisories/GHSA-273r-qr93-wgcp

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