Cacti: Unauthenticated RCE on Graph Image

published 2026-06-24 4 mo ago modified 2026-06-26 4 mo ago also EUVD-2026-39136

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.7%; EPSS 0.7% chance of exploitation in 30 days, percentile 53%
public exploits: 0; none known

Cacti is an open source performance and fault management framework. Versions 1.2.30 and prior have unauthenticated LFI through graph_theme and rrdtool IPC serialization hardening. This issue has been resolved in version 1.2.31.

Patch / fix

fixed in 1 distros 1 links 2

cacti cacti 1.2.31

cacti Debian 14 1.2.31+ds1-1

debian advisories DEBIAN-CVE-2026-39938

github.com/Cacti/cacti@9871f0c commit
github.com/Cacti/cacti/security/advisories/GHSA-rm7p-qcqm-x5m6 advisory

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: total
Assessed: 4 mo ago (2026-06-25)

Exploit prediction

0.69% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Cacti cacti

Classification

Weakness

CWE-22 Improper Limitation of a Pathname to a Restricted Directory
CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

github.com /Cacti/cacti/commit/9871f0cef9af285398d558c9b3188d5977e01a04
patch
github.com /Cacti/cacti/security/advisories/GHSA-rm7p-qcqm-x5m6
patch, vendor-advisory

Sources

CVE List CVE-2026-39938
NVD CVE-2026-39938

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary