CVE-2026-39902: Cacti: Authenticated RCE on Data Input

Severity: high (CVSS 7.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-23 · updated 2026-10-29
Weakness: CWE-78

Description

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.

Affected products

cacti: before 1.2.31

References

https://github.com/Cacti/cacti/pull/7112
https://github.com/Cacti/cacti/security/advisories/GHSA-c4qp-j9r9-fq24

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