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CVE-2026-39955

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

Published: Jun 24, 2026Updated: Jun 26, 2026 Sources: CVE List NVDCWE-89
9.8CRITICAL
NVD MITRE
EPSS Score
0.6%
Top 54.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

In plain language

AI Worth attention

Cacti (up to 1.2.30) has a serious database vulnerability that can be triggered over the network without logging in, so a typical small business using it should update to 1.2.31 or later as soon as possible.

Executive summary

CVE-2026-39955 is a pre-authentication SQL injection in Cacti’s graph_view.php (caused by an unanchored FILTER_VALIDATE_REGEXP), allowing attackers to execute unauthorized SQL over the network without any login.

If affected, business impact
Full database compromiseData theft or data tamperingService downtimePotential malware persistence

What to do now

  1. Check your Cacti version and confirm whether you are running Cacti 1.2.30 or earlier.
  2. If you are affected, upgrade Cacti to 1.2.31 (or later).
  3. After upgrading, review Cacti and web server logs for suspicious requests targeting graph_view.php.
  4. If you cannot upgrade immediately, restrict network access to Cacti so it is not reachable from the public internet.
Patch / advisory Usually a quick update

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-89

Affected Products

Cacti
oss-project
cactiOn-premWeb App
Enterprise Software / itsm-monitoring
and 1 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-39955?We can run the check for you — a free external exposure review, no install. Check my exposure

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/Cacti/cacti/commit/4c09efaebf3a9faec66969d0b5c4aceaf397f37f
github.com
https://github.com/Cacti/cacti/security/advisories/GHSA-gp82-qhrg-crv7
github.com

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