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

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- rnlab / Mobile builder: ≥ 0; ≤ 1.4.2 (affected, semver). Source: CNA: Wordfence

## Severity and prioritization

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: Wordfence

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-269

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/bc1a233e-ea62-4fb0-98eb-6b2aa893555d?source=cve (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L94 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L93 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L344 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L78 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L87 (CNA: Wordfence)

- https://plugins.trac.wordpress.org/browser/mobile-builder/trunk/api/class-mobile-builder-wcfm.php#L88 (CNA: Wordfence)

## Provenance

- CNA: Wordfence: https://www.cve.org/CVERecord?id=CVE-2026-104799; retrieved 2026-11-04; source updated 2026-11-04

Revision: 3846bcc66d0742f903388d625207a042319fc4ad6c6abcc664928c58890123dc

Canonical: https://y2.dev/cve/CVE-2026-104799

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.