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TI-2026-28910 Aliases CVE-2026-40080

Cacti: Open Redirect via HTTP_REFERER substring check in auth_login_redirect

Priority MEDIUM 60CWE-601Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-601.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00257 17th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed cacti (Cacti): 1.2.31

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Cacticactibefore 1.2.311.2.31Patch availableCNA
  • cacti VendorCacti Affected before 1.2.31 Fixed in 1.2.31 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:cacti:cacti:*:*:*:*:*:*:*:*before 1.2.31VulnerableCacti
  • cpe:2.3:a:cacti:cacti:*:*:*:*:*:*:*:* Versions before 1.2.31 Vulnerable ·Cacti

Remediation

  • Fix · CNA cacti (Cacti) Fixed in 1.2.31

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40080

References

Exploit 1

Other 1

  • TI-2022-22813 Unauthenticated command injection in cacti KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-20500 Unauthenticated SQL Injection in graph_view.php in Cacti CVSS 3.1CRITICAL 9.8
  • TI-2024-16869 Cacti RCE vulnerability when importing packages CVSS 3.1CRITICAL 9.1
  • TI-2024-20809 SQL Injection vulnerability in automation_get_new_graphs_sql CVSS 3.1HIGH 8.8
  • TI-2023-26750 Cacti SQL Injection vulnerability CVSS 3.1HIGH 8.8
  • TI-2025-18110 Cacti allows Arbitrary File Creation leading to RCE CVSS 4.0HIGH 8.7
See all 151 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences