# CVE-2026-40082

## Summary

- **CVE ID:** CVE-2026-40082
- **Severity:** MEDIUM
- **CVSS Score:** 5.4 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N)
- **CWE:** CWE-384
- **Published:** Jun 25, 2026
- **Last Modified:** Jun 26, 2026

## 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 — cacti (< 1.2.31)

## References

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

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.32%
- **EPSS Percentile:** 24.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._