CVE-2026-40080 | Cacti is an open source performance and fault management fra… | CVSS 6.1 MEDIUM

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.

Metadata

CVE ID: CVE-2026-40080
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-04-09 00:39 UTC
Published: 2026-06-25 22:29 UTC
Last updated: 2026-06-25 22:29 UTC
Primary CWE: CWE-601
CWE-601: URL Redirection to Untrusted Site ('Open Redirect')
Vendor / Product: Cacti / cacti
Sources: cve.org · NVD

Severity & Metrics

6.1 MEDIUM CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
Cacti	cacti	—	< 1.2.31

Weakness (CWE)

CWE	Source	Description
CWE-601	cna	CWE-601: URL Redirection to Untrusted Site ('Open Redirect')

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.1	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References (2)

https://github.com/Cacti/cacti/security/advisories/GHSA-6gr7-53g8-vchq https://github.com/Cacti/cacti/security/advisories/GHSA-6gr7-53g8-vchq
https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31 https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31