CVE-2026-39955 Cacti has Pre-Authentication SQL Injection via unanchored FILTER_VALIDATE_REGEXP in graph_view.php

Critical 9.8 Published 24 Jun 2026 Updated 26 Jun 2026

Attackers can execute arbitrary SQL commands without authentication in Cacti, potentially reading or modifying database contents.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-39955?

CVE-2026-39955 is a critical SQL injection vulnerability in Cacti Cacti, published on 24 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-89

Which versions are affected by CVE-2026-39955?

It affects 1 product.

Products include Cacti Cacti.

How do I fix CVE-2026-39955?

Upgrade to a fixed version.

Use parameterised queries everywhere and never build SQL by joining strings. Upgrade affected software first; a web application firewall only buys time. More about SQL injection.

Is CVE-2026-39955 being exploited?

There is no known exploitation of CVE-2026-39955 in the wild and no public exploit code.

All Cacti Cacti vulnerabilities

Sources

Also known as DEBIAN-CVE-2026-39955, GHSA-gp82-qhrg-crv7, UBUNTU-CVE-2026-39955.