cvedb.io
CVE-2026-8809
CRITICAL · CVSS 9.8
EPSS exploitation probability: 0%
Published 2026-05-28T23:16:44.760 · Last modified 2026-06-17T11:04:29.130

Summary

The Advanced Custom Fields: Extended plugin for WordPress is vulnerable to Privilege Escalation via Validation Bypass in all versions up to and including 0.9.2.5. The vulnerability exists due to the after_validate_save_post() function unconditionally trusting the attacker-controlled _acf_post_id POST parameter — with no authentication or integrity verification — to select a cleanup branch that silently discards all validation errors not prefixed with acfe:. This makes it possible for unauthenticated attackers to suppress both the role allow-list validation error added by acfe_field_user_roles::validate_front_value() and the administrator-role capability guard error added by acfe_module_form_action_user::validate_action(), causing wp_insert_user() to execute with an attacker-supplied admini

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.