rnlab Mobile builder Plugin up to 1.4.2 on WordPress REST wcfm-profile-settings wcfmmp_profile_settings key/data privileges management

Summaryinfo

A vulnerability was found in rnlab Mobile builder Plugin up to 1.4.2 and classified as critical. Affected by this issue is the function wcfmmp_profile_settings of the file /mobile-builder/v1/wcfm-profile-settings of the component REST Handler. Such manipulation of the argument key/data leads to privileges management. This vulnerability is documented as CVE-2026-104799. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in rnlab Mobile builder Plugin up to 1.4.2. It has been rated as critical. Affected by this issue is the function wcfmmp_profile_settings of the file /mobile-builder/v1/wcfm-profile-settings of the component REST Handler. The manipulation of the argument key/data with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at wordfence.com. This vulnerability is handled as CVE-2026-104799 since 10/02/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 11/04/2026). The MITRE ATT&CK project declares the attack technique as T1068.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• rnlab

Name

• Mobile builder Plugin

Version

• 1.4.0
• 1.4.1
• 1.4.2

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Once again VulDB remains the best source for vulnerability data.

Discussion