cacti: Cacti is an open source performance and fault management framework
CVE-2026-40080 is fixed in cacti on 1 platform by DEBIAN-CVE-2026-40080 (version 1.2.31+ds1-1), released July 14, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| cacti · Debian 14 | 1.2.31+ds1-1 | DEBIAN-CVE-2026-40080 | Jul 14, 2026 |
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