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CVE-2026-40080— Cacti: Open Redirect via HTTP_REFERER substring check in auth_login_redirect

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及之前版本存在输入验证错误漏洞，该漏洞源于使用子字符串检查而非主机检查，导致存在重定向漏洞。

CVSS 6.1 · Medium EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
Cacti cacti < 1.2.31 affected
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I. Basic Information for CVE-2026-40080

Vulnerability Information
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Vulnerability Title
Cacti: Open Redirect via HTTP_REFERER substring check in auth_login_redirect
Source: CVE Program / CVE List V5
Vulnerability Description
Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior are vulnerable to Open Redirect through a substring check rather than a host check at str_contains($referer, CACTI_PATH_URL). When the user's login_opts == '1' (redirect to referer after login), the function used $_SERVER['HTTP_REFERER'] directly. An attacker could craft a referer such as https://evil.com/cacti/. Where CACTI_PATH_URL is /cacti/, the substring matches and the user is redirected to evil.com after login. The pre-existing validate_redirect_url() helper at lib/html_utility.php performed proper validation but was not invoked from auth_login_redirect(). 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:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Cacti 输入验证错误漏洞
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及之前版本存在输入验证错误漏洞，该漏洞源于使用子字符串检查而非主机检查，导致存在重定向漏洞。
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-2026-40080

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III. Intelligence Information for CVE-2026-40080

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Patches & Fixes for CVE-2026-40080 (1)

Vendor Advisories for CVE-2026-40080 (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-2026-40082 5.4 MEDIUM Cacti: Session Fixation via missing session_regenerate_id() after login
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-601

V. Comments for CVE-2026-40080

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