CVE-2026-8809 | 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:. Th
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 administrator role argument and resulting in the creation of a new administrator-level user account. Exploitation requires the target site to expose a public ACFE frontend form configured with a Create User action that maps a role field.
- 🔗 www.wordfence.com/threat-intel/vulnerabilities/id/bd332f49-…
- 🔗 plugins.trac.wordpress.org/browser/acf-extended/tags/0.9.2.4/include…
- 🔗 plugins.trac.wordpress.org/browser/acf-extended/tags/0.9.2.4/include…
- 🔗 plugins.trac.wordpress.org/browser/acf-extended/tags/0.9.2.4/include…
- 🔗 plugins.trac.wordpress.org/browser/acf-extended/tags/0.9.2.4/include…
- 🔗 plugins.trac.wordpress.org/changeset/3551665/acf-extended
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📊 Historien-Charts — Criticals-Trend · Vendors · EPSS-Verteilung
| Tier | 2026-09-04 | 2026-09-21 |
|---|---|---|
| ≥90 % | 0 | 488 |
| ≥50 % | 0 | 1471 |
| ≥10 % | 0 | 7 |
| <10 % | 300 | 0 |
CVE-2026-8809 | 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:. Th
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 uncon
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