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CVE-2026-39938

CriticalPublished

Cacti: Unauthenticated RCE on Graph Image

Published: Jun 24, 2026
Updated: Jun 26, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability estimate

0.7%

Low · next 30 days

Percentile: 51.1%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-39938PoC
Detailed CVE-2026-39938 vulnerability report for Cacti ≤1.2.30, demonstrating unauthenticated LFI chained to OS command injection RCE with PoC, root cause analysis, and remediation guidance.
By-Poloss..-..CVE-2026-39938PoC
Proof-of-concept exploit for CVE-2026-39938: unauthenticated local file inclusion in Cacti <= 1.2.30, enabling arbitrary file read and remote code execution via log poisoning.

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