Vulnerability Report

CVE-2026-40082

Title: Cacti Session Fixation via missing session_regenerate_id()

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-40082.

CWE Category CWE-384

Published Date Jun 25, 2026

Modified Date Jun 29, 2026

Exploit Status Not Found

Score 5.4 CVSS v3.1

Exploit Probability (EPSS)

0.23%

Vulnerability Summary

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.

Impacted Vendors

the_cacti_group 1

cacti 1

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.4

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-40082 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

June 29, 2026 MODIFIED

Vulnerability data updated via NVD.

June 26, 2026 MODIFIED

Vulnerability data updated via NVD.

June 26, 2026 MODIFIED

Vulnerability data updated via NVD.

June 25, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction REQUIRED

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected Stack

No specific products linked.