# CVE-2026-112862: xnau webdesign Participants Database PHP object injection

Source: https://junglewise.ai/threats/cve-2026-112862-deserialization-of-untrusted-data-vulnerability-in-xnau  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-23. Updated: 2026-10-23  
License: CC BY 4.0 with a link back

CVE-2026-112862 · Severity: critical · CVSS 9.8 · Published 2026-10-23

Participants Database is a WordPress plugin that manages event participant information and registrations. An unauthenticated attacker can inject malicious PHP objects into the plugin, allowing them to execute arbitrary code on the web server and take complete control of the website.

Technologies: [Xnau Webdesign Participants Database](https://junglewise.ai/threats/technologies/participants-database). Vendors: [Xnau Webdesign](https://junglewise.ai/threats/vendors/xnau-webdesign).

## Quick answers

**Is CVE-2026-112862 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-112862 being exploited in the wild.

**How severe is CVE-2026-112862?** Critical severity, with a CVSS score of 9.8, published 23 October 2026.

**Which products and versions are affected?** Xnau Webdesign Participants Database through 2.7.8.5.

**Is there a fix for CVE-2026-112862?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-112862 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-112862?** Check whether you run Xnau Webdesign Participants Database 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 plugin deserializes untrusted data without proper validation, enabling PHP object injection attacks. An unauthenticated, remote attacker can exploit this vulnerability to instantiate arbitrary PHP objects and trigger malicious code execution on the server, potentially leading to full system compromise.

## Affected products

- xnau webdesign Participants Database through 2.7.8.5

## Timeline

- 2026-10-23: disclosed
- 2026-10-21: advisory

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/participants-database/vulnerability/wordpress-participants-database-plugin-2-7-8-5-php-object-injection-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/participants-database/vulnerability/wordpress-participants-database-plugin-2-7-8-5-php-object-injection-vulnerability?_s_id=cve)

## Related threats

- [xnau webdesign Participants Database SQL injection](https://junglewise.ai/threats/cve-2026-112860-improper-neutralization-of-special-elements-used-in-an-sql)
- [xnau webdesign Participants Database access control bypass](https://junglewise.ai/threats/cve-2026-112861-authorization-bypass-through-user-controlled-key-vulnerability)
- [Roland Barker Participants Database arbitrary file deletion](https://junglewise.ai/threats/cve-2026-59555-roland-barker-participants-database-arbitrary-file-deletion)
- [Roland Barker Participants Database SQL injection](https://junglewise.ai/threats/cve-2026-59525-roland-barker-participants-database-sql-injection)
- [Roland Barker Participants Database broken access control](https://junglewise.ai/threats/cve-2026-27423-roland-barker-participants-database-broken-access-control)