What is CVE-2026-39902?

CVE-2026-39902 is a high-severity vulnerability in Cacti, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-10-23.

How severe is CVE-2026-39902?

High severity. CVSS v3 base score is 7.2 out of 10.

RCE in Cacti

CVE-2026-39902

Cacti is an open source performance and fault management framework. Prior to version 1.2.31, the prior blocklist ([;&| `$\\n\r]) omitted single-quote, double-quote, redirect operators, subshell parens and braces. An authenticated admin could save an input_string` containing single-quote, redirect operator, or subshell parens, and pass the check. This issue has been patched in version 1.2.31.

Vulnerability class: Command Injection (OS Command Injection)

Published 2026-10-23 · last modified 2026-10-23.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Cacti — versions < 1.2.31

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

Frequently asked questions

What is CVE-2026-39902?: CVE-2026-39902 is a high-severity vulnerability in Cacti, classified under OS Command Injection. CVSS score: 7.2/10. Published 2026-10-23.
How severe is CVE-2026-39902?: High severity. CVSS v3 base score is 7.2 out of 10.