# CVE-2026-109699: ThemeGrill User Registration broken access control

Source: https://junglewise.ai/threats/cve-2026-109699-missing-authorization-vulnerability-in-themegrill-user  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-13. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-109699 · Severity: medium · CVSS 5.4 · Published 2026-10-13

ThemeGrill User Registration is a WordPress plugin for managing user sign-ups and account registration on websites. An incorrectly configured access control flaw allows unauthenticated attackers to view other users' data or perform unauthorized actions on the site. This could expose sensitive user information or allow malicious modifications without proper authorization.

Technologies: [ThemeGrill User Registration](https://junglewise.ai/threats/technologies/themegrill-user-registration). Vendors: [ThemeGrill](https://junglewise.ai/threats/vendors/themegrill).

## Quick answers

**Is CVE-2026-109699 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109699 being exploited in the wild.

**How severe is CVE-2026-109699?** Medium severity, with a CVSS score of 5.4, published 13 October 2026.

**Which products and versions are affected?** ThemeGrill User Registration through 5.2.8.

**Is there a fix for CVE-2026-109699?** Yes: fixed in 5.3.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-109699 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-109699?** Check whether you run ThemeGrill User Registration 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.

## How to fix

- Fixed in 5.3.0

## Technical details

The plugin suffers from broken access control (CWE-639) in its user registration functionality, allowing unauthenticated access to protected pages and functions. An attacker can bypass access restrictions to view or manipulate user data that should be restricted. The vulnerability exists in versions up to 5.2.8 and does not require any prior authentication or user interaction to exploit.

## Affected products

- ThemeGrill User Registration through 5.2.8

## Timeline

- 2026-10-13: disclosed
- 2026-10-13: patched: Version 5.3.0 released

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/user-registration/vulnerability/wordpress-user-registration-plugin-5-2-8-broken-access-control-vulnerability-2?_s_id=cve](https://patchstack.com/database/wordpress/plugin/user-registration/vulnerability/wordpress-user-registration-plugin-5-2-8-broken-access-control-vulnerability-2?_s_id=cve)

## Related threats

- [ThemeGrill User Registration broken access control](https://junglewise.ai/threats/cve-2026-124258-missing-authorization-vulnerability-in-themegrill-user)
- [ThemeGrill User Registration broken access control](https://junglewise.ai/threats/cve-2026-119522-missing-authorization-vulnerability-in-themegrill-user)
- [ThemeGrill User Registration missing authorization](https://junglewise.ai/threats/cve-2026-120840-missing-authorization-vulnerability-in-themegrill-user)
- [ThemeGrill User Registration Cross Site Scripting](https://junglewise.ai/threats/cve-2026-27061-subscriber-cross-site-scripting-xss-in-user-registration-5-3-0)
- [ThemeGrill User Registration broken access control](https://junglewise.ai/threats/cve-2026-25450-missing-authorization-vulnerability-in-themegrill-user)