# CVE-2026-90907: Joomla CMS authorization bypass in profile.save controller

Source: https://junglewise.ai/threats/cve-2026-90907-joomla-core-20260902-core-unauthorized-user-account-creation-via  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-29. Updated: 2026-09-29  
License: CC BY 4.0 with a link back

CVE-2026-90907 · Severity: info · Published 2026-09-29

Joomla is a popular content management system that powers millions of websites. A flaw in the profile.save controller allowed unauthenticated attackers to create user accounts on sites where user registration was disabled, bypassing the site administrator's access controls. This could enable unauthorized account creation and potential site compromise.

Technologies: [Joomla! CMS](https://junglewise.ai/threats/technologies/joomla-joomla-cms-1). Vendors: [Joomla!](https://junglewise.ai/threats/vendors/joomla).

## Quick answers

**Is CVE-2026-90907 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-90907 being exploited in the wild.

**How severe is CVE-2026-90907?** Informational severity, published 29 September 2026.

**Which products and versions are affected?** Joomla! CMS 1.5.0-5.4.8, 6.0.0-6.1.3.

**Is there a fix for CVE-2026-90907?** A patch was published on 2026-09-25. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-90907 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-90907?** Check whether you run Joomla! CMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The profile.save controller failed to validate user login state before processing account creation requests, allowing authorization bypass via missing authentication checks. An unauthenticated attacker can send a specially crafted request to create new guest-level user accounts regardless of site registration settings. A fix was released on 2026-09-25 in versions 5.4.9 and 6.1.4.

## Affected products

- Joomla CMS 1.5.0-5.4.8, 6.0.0-6.1.3

## Timeline

- 2026-09-29: disclosed
- 2026-09-25: patched

## References

- [https://developer.joomla.org/security-centre/1082-20260902-core-unauthorized-user-account-creation-via-profile-save-controller.html](https://developer.joomla.org/security-centre/1082-20260902-core-unauthorized-user-account-creation-via-profile-save-controller.html)
- [https://www.joomla.org/](https://www.joomla.org/)

## Related threats

- [Joomla CMS server-side request forgery in core extensions](https://junglewise.ai/threats/cve-2026-92222-joomla-core-20260909-core-ssrf-vectors-in-various-core-extensions)