CVE-2026-40080

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
6.1
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.1Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.1
EG Score
6.1(medium)
EPSS
4.7%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Jun 25, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Open Redirect via HTTP_REFERER substring check in auth_login_redirect · Advisory · Cacti/cacti · GitHub

https://github.com/Cacti/cacti/security/advisories/GHSA-6gr7-53g8-vchq

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-12 13:21 UTCEG score recompute
  2. 2026-07-12 05:46 UTCEPSS rescore
  3. 2026-07-11 12:33 UTCEG score recompute
  4. 2026-07-11 08:27 UTCEPSS rescore
  5. 2026-07-10 11:44 UTCEG score recompute
  6. 2026-07-09 19:10 UTCEPSS rescore
  7. 2026-07-09 10:46 UTCEG score recompute
  8. 2026-07-08 15:15 UTCEPSS rescore
  9. 2026-07-08 09:48 UTCEG score recompute
  10. 2026-07-07 13:46 UTCEPSS rescore
  11. 2026-07-07 09:01 UTCEG score recompute
  12. 2026-07-06 16:27 UTCEPSS rescore
  13. 2026-07-06 16:27 UTCEPSS rescore
  14. 2026-07-06 08:00 UTCEG score recompute
  15. 2026-07-05 07:09 UTCEG score recompute
  16. 2026-07-05 02:30 UTCEPSS rescore
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-04 06:19 UTCEG score recompute
  19. 2026-07-03 05:29 UTCEG score recompute
  20. 2026-07-02 04:41 UTCEG score recompute
  21. 2026-07-01 15:06 UTCEPSS rescore
  22. 2026-07-01 03:53 UTCEG score recompute
  23. 2026-06-30 23:22 UTCEPSS rescore
  24. 2026-06-30 03:05 UTCEG score recompute
  25. 2026-06-29 02:16 UTCEG score recompute
Show 7 more
  1. 2026-06-28 14:07 UTCEPSS rescore
  2. 2026-06-28 04:56 UTCEPSS rescore
  3. 2026-06-28 01:28 UTCEG score recompute
  4. 2026-06-27 03:08 UTCEPSS rescore
  5. 2026-06-27 00:40 UTCEG score recompute
  6. 2026-06-25 23:51 UTCEG score recompute
  7. 2026-06-25 23:50 UTCNVD updatefirst tracked

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Frequently asked(5)

What is CVE-2026-40080?
CVE-2026-40080 is a medium vulnerability published on June 25, 2026. 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 strcontains($referer, CACTIPATHURL). When the user's loginopts == '1' (redirect to referer after login), the function…
When was CVE-2026-40080 disclosed?
CVE-2026-40080 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40080 actively exploited?
CVE-2026-40080 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 4.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40080?
CVE-2026-40080 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-40080?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40080, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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