# CVE-2026-27061: ThemeGrill User Registration Cross Site Scripting

Source: https://junglewise.ai/threats/cve-2026-27061-subscriber-cross-site-scripting-xss-in-user-registration-5-3-0  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-30. Updated: 2026-10-30  
License: CC BY 4.0 with a link back

CVE-2026-27061 · Severity: medium · CVSS 6.5 · Published 2026-10-30

ThemeGrill User Registration is a WordPress plugin that provides user registration and profile management features for websites. A cross-site scripting (XSS) vulnerability in versions 5.3.0 and earlier allows a subscriber-level attacker to inject malicious scripts into the site. An attacker could exploit this to steal visitor data or hijack user accounts.

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

## Quick answers

**Is CVE-2026-27061 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-27061 being exploited in the wild.

**How severe is CVE-2026-27061?** Medium severity, with a CVSS score of 6.5, published 30 October 2026.

**Which products and versions are affected?** ThemeGrill User Registration <= 5.3.0.

**Is there a fix for CVE-2026-27061?** Yes: fixed in 5.3.1 or later. Until then: Update to version 5.3.1 or later immediately. If unable to update, use Patchstack or a similar WordPress security plugin to apply a mitigation rule that blocks attacks until patching is completed. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-27061 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-27061?** 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 5.3.1 or later

Update to version 5.3.1 or later immediately. If unable to update, use Patchstack or a similar WordPress security plugin to apply a mitigation rule that blocks attacks until patching is completed.

## Technical details

The vulnerability is a stored or reflected XSS flaw in the User Registration plugin affecting versions up to 5.3.0. Exploitation requires a subscriber-level user or higher to perform an action such as clicking a malicious link or submitting a crafted form. A successful attack allows injection of arbitrary JavaScript that executes in the context of other users' browsers, enabling credential theft or account hijacking.

## Affected products

- ThemeGrill User Registration <= 5.3.0

## Timeline

- 2026-10-30: disclosed
- 2026-10-30: patched: 5.3.1 released

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/user-registration/vulnerability/wordpress-user-registration-plugin-5-3-0-cross-site-scripting-xss-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/user-registration/vulnerability/wordpress-user-registration-plugin-5-3-0-cross-site-scripting-xss-vulnerability?_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 broken access control](https://junglewise.ai/threats/cve-2026-25450-missing-authorization-vulnerability-in-themegrill-user)
- [ThemeGrill User Registration XSS in HTML tag neutralization](https://junglewise.ai/threats/cve-2026-25467-improper-neutralization-of-script-related-html-tags-in-a-web-page)