CVE-2026-39900: Cacti is an open source performance and fault management framework

Q: How do I fix CVE-2026-39900?

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

Q: Is CVE-2026-39900 being exploited?

CVE-2026-39900 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-2026-39900 affect?

CVE-2026-39900 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 Reflected XSS via tab parameter in the auth_profile.php JavaScript context. This issue has been fixed in version 1.2.31.

Q: How urgent is CVE-2026-39900?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2026-39900 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 Reflected XSS via tab parameter in the auth_profile.php JavaScript context. This issue has been fixed in version 1.2.31.

Why this priority

No elevated risk signals yet

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 82%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-06-24
Last modified	2026-06-25

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

Last updated 2026-06-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-24 23:16 UTCPublished CVE record published
2026-06-25 15:00 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-2026-39900?

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

Is CVE-2026-39900 being exploited?

CVE-2026-39900 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-2026-39900 affect?

CVE-2026-39900 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 Reflected XSS via tab parameter in the auth_profile.php JavaScript context. This issue has been fixed in version 1.2.31.

How urgent is CVE-2026-39900?

Priority 26/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities

Related CVEs

CVE-2026-40083 HIGH 7.2 UPGRADE Cacti is an open source performance and fault management framework
CVE-2026-40080 MEDIUM 6.1 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

References

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