# CVE-2026-105882: ThemeGrill User Registration stored cross-site scripting

Source: https://junglewise.ai/threats/cve-2026-105882-improper-neutralization-of-input-during-web-page-generation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-15. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-105882 · Severity: medium · CVSS 6.5 · Published 2026-10-15

The ThemeGrill User Registration plugin for WordPress allows authenticated attackers to inject malicious scripts that execute in other users' browsers. This stored XSS vulnerability can lead to account takeover, credential theft, or malware distribution to site visitors. Websites using versions 5.2.8 and earlier are at risk and must upgrade immediately.

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

## Quick answers

**Is CVE-2026-105882 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-105882 being exploited in the wild.

**How severe is CVE-2026-105882?** Medium severity, with a CVSS score of 6.5, published 15 October 2026.

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

**Is there a fix for CVE-2026-105882?** 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-2026-105882 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-105882?** 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

A stored cross-site scripting vulnerability exists in ThemeGrill User Registration through version 5.2.8, where input is not properly neutralized during web page generation. The vulnerability requires a subscriber-level account to inject malicious script, but the injected payload persists and executes in the context of other users' sessions. The vulnerability is fixed in version 5.3.0.

## Affected products

- ThemeGrill User Registration 5.2.8 and earlier

## Timeline

- 2026-10-15: disclosed
- 2026-10-13: advisory
- 2026-10-13: patched

## 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-cross-site-scripting-xss-vulnerability-2?_s_id=cve](https://patchstack.com/database/wordpress/plugin/user-registration/vulnerability/wordpress-user-registration-plugin-5-2-8-cross-site-scripting-xss-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)