# CVE-2026-115968: Ultimate Member plugin PHP object injection

Source: https://junglewise.ai/threats/cve-2026-115968-deserialization-of-untrusted-data-vulnerability-in-ultimate  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-28. Updated: 2026-10-28  
License: CC BY 4.0 with a link back

CVE-2026-115968 · Severity: critical · CVSS 9.8 · Published 2026-10-28

Ultimate Member is a WordPress plugin that manages user accounts and memberships on websites. A PHP object injection vulnerability allows unauthenticated attackers to manipulate how the site processes data and execute arbitrary code on the server. This could lead to complete compromise of the WordPress installation and its data.

Technologies: [Ultimate Member](https://junglewise.ai/threats/technologies/ultimate-member). Vendors: [Ultimate Member](https://junglewise.ai/threats/vendors/ultimate-member).

## Quick answers

**Is CVE-2026-115968 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-115968 being exploited in the wild.

**How severe is CVE-2026-115968?** Critical severity, with a CVSS score of 9.8, published 28 October 2026.

**Which products and versions are affected?** Ultimate Member through 2.13.1.

**Is there a fix for CVE-2026-115968?** Yes: fixed in 2.14.0 and later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-115968 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-115968?** Check whether you run Ultimate Member 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 2.14.0 and later

## Technical details

The plugin deserializes untrusted data without proper validation, allowing object injection attacks. The vulnerability affects versions up to 2.13.1 and requires no authentication or user interaction, making it exploitable via network attack vectors. An unauthenticated attacker can leverage PHP magic methods to achieve remote code execution on the affected WordPress server.

## Affected products

- Ultimate Member Ultimate Member through 2.13.1

## Timeline

- 2026-10-28: disclosed
- 2026-10-26: patched: Version 2.14.0 released

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/ultimate-member/vulnerability/wordpress-ultimate-member-plugin-2-13-1-php-object-injection-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/ultimate-member/vulnerability/wordpress-ultimate-member-plugin-2-13-1-php-object-injection-vulnerability?_s_id=cve)

## Related threats

- [Ultimate Member plugin stored cross-site scripting in textarea field](https://junglewise.ai/threats/cve-2026-116621-the-ultimate-member-user-profile-registration-login-member)
- [Ultimate Member WordPress plugin Stored XSS in user_url parameter](https://junglewise.ai/threats/cve-2026-107625-the-ultimate-member-user-profile-registration-login-member)
- [Ultimate Member privilege escalation in role assignment](https://junglewise.ai/threats/cve-2026-96539-incorrect-privilege-assignment-vulnerability-in-ultimate-member)
- [Ultimate Member privilege escalation in user authorization](https://junglewise.ai/threats/cve-2026-96451-authorization-bypass-through-user-controlled-key-vulnerability-in)
- [Ultimate Member WordPress plugin authorization bypass in member profile fields](https://junglewise.ai/threats/cve-2026-93428-the-ultimate-member-user-profile-registration-login-member)