CVE-2026-39955: Cacti is an open source performance and fault management framework

Q: How do I fix CVE-2026-39955?

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

Q: Is CVE-2026-39955 being exploited?

CVE-2026-39955 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-2026-39955 affect?

CVE-2026-39955 affects cacti. Severity is critical (CVSS 9.8). Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have pre-authentication SQL Injection via unanchored FILTER_VALIDATE_REGEXP in graph_view.php. This issue has been fixed in version 1.2.31.

Q: How urgent is CVE-2026-39955?

Priority 51/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.8REMOTEUPGRADE

CVE-2026-39955 is a critical-severity flaw (CVSS 9.8) 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 have pre-authentication SQL Injection via unanchored FILTER_VALIDATE_REGEXP in graph_view.php. This issue has been fixed in version 1.2.31.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-89
Published	2026-06-24
Last modified	2026-06-26

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

Last updated 2026-06-26 · 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
2026-06-26 05:16 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-2026-39955?

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

Is CVE-2026-39955 being exploited?

CVE-2026-39955 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-2026-39955 affect?

CVE-2026-39955 affects cacti. Severity is critical (CVSS 9.8). Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have pre-authentication SQL Injection via unanchored FILTER_VALIDATE_REGEXP in graph_view.php. This issue has been fixed in version 1.2.31.

How urgent is CVE-2026-39955?

Priority 51/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

PHP vulnerabilities

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References

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