CVE-2026-40080 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-40080MEDIUM

Cacti: Open Redirect via HTTP_REFERER substring check in auth_login_redirect

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   R  C  L  L  N    6.1   .0019    9.2     —

AFFECTED
  Product  Versions    Fixed
  cacti    < 1.2.31 –  —

TIMELINE
  Apr 9   Reserved by GitHub_M
  Jun 25  EXPLOIT PUBLISHED — CVE-2026-40080 (cacti). Public exploit reference added.
  Jun 25  Published (CNA: GitHub_M)

CWE-601 · CNA: GitHub_M · CVSS v3.1 · 2 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
April 9, 2026	Reserved	Reserved by GitHub_M
June 25, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-40080 (cacti). Public exploit reference added.
June 25, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Cacti	cacti	—	< 1.2.31	—

Weaknesses

CWE-601

References (2)

https://github.com/Cacti/cacti/releases/tag/release%2F1.2.31 [Product, Release Notes]
https://github.com/Cacti/cacti/security/advisories/GHSA-6gr7-53g8-vchq [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-40080 at cve.org

Vendors: cacti

Weaknesses: CWE-601

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-40080 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.