CVE-2026-81343 in ACF Frontend Admin Plugin
Summary
by MITRE • 10/17/2026
The ACF Frontend Admin by DynamiApps WordPress plugin through 3.29.13 does not perform a capability check on one of its form-submission actions before writing submitted values into the site's global ACF options store, allowing unauthenticated visitors to overwrite site-wide option values via a public form.
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Analysis
by VulDB Data Team • 10/17/2026
The vulnerability identified in the ACF Frontend Admin plugin by DynamiApps, specifically affecting versions through 3.29.13, represents a critical failure in access control mechanisms within WordPress environments. This flaw stems from an insufficient verification of user permissions before executing sensitive administrative operations. Specifically, when handling form submissions intended for frontend data entry, the application fails to validate whether the initiating request originates from a user with sufficient privileges or is even authenticated at all. Instead of restricting write-access capabilities to administrators or authorized editors, the plugin blindly accepts input from any visitor accessing the public-facing forms and proceeds to process that data without checking if the actor possesses the necessary WordPress capabilities for such an action.
This technical deficiency allows unauthenticated attackers to manipulate site-wide configuration values stored in the global Advanced Custom Fields options store. By crafting malicious HTTP requests containing specific form fields, a remote attacker can overwrite critical administrative settings. The operational impact of this vulnerability is severe because it effectively grants unauthorized users the ability to alter core website configurations that are typically reserved for high-privilege accounts. This could lead to defacement, where an attacker modifies site branding or content; data exfiltration if sensitive configuration parameters containing credentials or API keys are exposed through subsequent requests; or complete service disruption by altering settings related to security headers, user registration policies, or database connections.
From a classification perspective, this issue aligns with CWE-284, which describes Improper Access Control, as the system fails to enforce proper authorization checks before allowing state-changing operations. Furthermore, it relates closely to CWE-601, URL Redirection to Untrusted Destination, if the vulnerability is leveraged in conjunction with other flaws for phishing or session hijacking, but primarily it falls under unauthorized modification of configuration data. In terms of the MITRE ATT&CK framework, this behavior corresponds to Tactic TA0005 Defense Evasion and potentially TA0003 Persistence, depending on how the overwritten options are utilized by an attacker to maintain access or hide their presence within the WordPress environment.
Mitigation strategies must prioritize immediate remediation through software updates. Administrators should upgrade the ACF Frontend Admin plugin to version 3.29.14 or later, where this capability check has been properly implemented to ensure that only authenticated users with appropriate roles can submit forms that affect global options. In cases where updating is not immediately feasible, temporary workarounds include restricting access to any public-facing forms via IP whitelisting if the use case permits, or implementing a Web Application Firewall rule set designed to detect and block anomalous POST requests targeting known vulnerable endpoints associated with this plugin. Regular auditing of WordPress capabilities and strict adherence to the principle of least privilege are essential practices to prevent similar authorization bypasses in future development cycles.