CVE-2026-40080: Cacti is an open source performance and fault management framework

Q: How do I fix CVE-2026-40080?

cacti: upgrade to 1.2.31. Exact commands for each OS are on this page.

Q: Is CVE-2026-40080 being exploited?

CVE-2026-40080 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40080 affect?

CVE-2026-40080 affects cacti. Severity is medium (CVSS 6.1). 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 logi

Q: How urgent is CVE-2026-40080?

Priority 31/100. Public exploit reference

Routine

MEDIUM 6.1UPGRADE

CVE-2026-40080 is a medium-severity flaw (CVSS 6.1) affecting cacti. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 sub

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-601
Published	2026-06-25
Last modified	2026-06-29

Publisher (CNA): GitHub, Inc. · Vendor: cacti

Last updated 2026-06-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-25 23:17 UTCPublished CVE record published
2026-06-29 18:52 UTCUpdated Record last modified

cacti cacti UPGRADE

Affected: < 1.2.31

Fixed in: 1.2.31

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy cacti || rpm -q cacti || cacti --version

2. UPGRADE to 1.2.31 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cacti

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cacti

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40080?

cacti: upgrade to 1.2.31. Exact commands for each OS are on this page.

Is CVE-2026-40080 being exploited?

CVE-2026-40080 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40080 affect?

CVE-2026-40080 affects cacti. Severity is medium (CVSS 6.1). 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 logi

How urgent is CVE-2026-40080?

Priority 31/100. Public exploit reference

Related CVEs

CVE-2026-40083 HIGH 7.2 UPGRADE Cacti is an open source performance and fault management framework
CVE-2026-40082 MEDIUM 5.4 UPGRADE Cacti is an open source performance and fault management framework
CVE-2026-40084 MEDIUM 6.5 UPGRADE Cacti is an open source performance and fault management framework
CVE-2026-40941 MEDIUM 6.5 UPGRADE Cacti is an open source performance and fault management framework
CVE-2026-39951 HIGH 7.6 UPGRADE Cacti is an open source performance and fault management framework

References

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