CVE-2026-110018
HighCVSS 8.8Exploitation Probability (EPSS)
Low risk33th percentile - higher than 33% of all known CVEs
Summary
The aBlocks plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 2.17.0 via the /ablocks/v1/form-builder/registration REST endpoint. The endpoint is registered with permission_callback => __return_true and the register() handler reads roleSlug directly from attacker-controlled block attributes without verifying that formType is registration, allowing authenticated attackers with Contributor-level access and above to escalate their role to Editor or another non-administrator role and receive a fully authenticated session at the elevated privilege level.
Risk Assessment
An authenticated attacker with Contributor-level access can escalate their role to Editor or another non-administrator role and obtain a session with elevated privileges. This may allow modification of site content and configuration within the Editor role's permissions.
Recommendation
Update the aBlocks plugin to a version later than 2.17.0. Until then, limit the number of Contributor-level users or consider disabling the plugin.
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Original NVD description (English source)
The aBlocks – Gutenberg Blocks, User Dashboard Builder, Popup Builder, Form Builder & Animation Builder plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 2.17.0 via the `/ablocks/v1/form-builder/registration` REST endpoint. The vulnerability exists because the endpoint is registered with `permission_callback => __return_true` and the `register()` handler reads `roleSlug` directly from attacker-controlled block attributes in `post_content` without ever verifying that the block's `formType` is `registration` — a condition that `RegistrationFormSanitizer::verify()` imposes only at save-time, meaning a Contributor can preserve an arbitrary `roleSlug` by saving a block with `formType='login'` and then triggering the endpoint via a valid `wp_rest` nonce and post-ownership check. This makes it possible for authenticated attackers, with Contributor-level access and above, to escalate their WordPress role to Editor or any other non-administrator role and receive a fully authenticated session at the elevated privilege level via `WP_User::set_role()` and `wp_set_auth_cookie()`. Escalation is bounded below administrator-tier roles because `is_safe_registration_role()` rejects any role holding `manage_options`, `edit_users`, `delete_users`, `create_users`, `promote_users`, or `edit_theme_options`, meaning the highest practically reachable role on a standard WordPress installation is Editor.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS