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

Quick assessment

Affected
Cacti cacti
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cacti是Cacti团队开源的一款日志分析与审计软件。 Cacti 1.2.30及之前版本存在会话机制问题漏洞，该漏洞源于登录后缺少session_regenerate_id()调用，可能导致会话固定攻击。

CVSS 5.4 · Medium EPSS 0.32% · P23

Affected Version Matrix 1

VendorProduct Version RangeStatus
Cacti cacti < 1.2.31 affected
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I. Basic Information for CVE-2026-40082

Vulnerability Information
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Vulnerability Title
Cacti: Session Fixation via missing session_regenerate_id() after login
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
会话固定
Source: CVE Program / CVE List V5
Vulnerability Title
Cacti 会话机制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cacti是Cacti团队开源的一款日志分析与审计软件。 Cacti 1.2.30及之前版本存在会话机制问题漏洞，该漏洞源于登录后缺少session_regenerate_id()调用，可能导致会话固定攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cacti cacti < 1.2.31 -

II. Public POCs for CVE-2026-40082

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III. Intelligence Information for CVE-2026-40082

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Patches & Fixes for CVE-2026-40082 (2)

Vendor Advisories for CVE-2026-40082 (1)

Same Patch Batch · Cacti · 2026-06-25 · 5 CVEs total

CVE-2026-40083 7.2 HIGH Cacti: SQL Injection in managers.php
CVE-2026-40084 6.5 MEDIUM Cacti: Arbitrary File Read via Path Traversal in Report `format_file` Parameter
CVE-2026-40080 6.1 MEDIUM Cacti: Open Redirect via HTTP_REFERER substring check in auth_login_redirect
CVE-2026-40941 Cacti: Package Import Signature Validation Bypass Allows Self-Signed Packages

IV. Related Vulnerabilities

Same product: cacti
Same vendor: Cacti
Same weakness: CWE-384

V. Comments for CVE-2026-40082

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