Advanced Custom Fields Plugin up to 0.9.1.1 on WordPress prepare_form code injection

Summaryinfo

A vulnerability classified as critical has been found in Advanced Custom Fields Plugin up to 0.9.1.1 on WordPress. Affected by this issue is the function prepare_form. Performing a manipulation results in Remote Code Execution. This vulnerability is reported as CVE-2025-13486. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as critical, was found in Advanced Custom Fields Plugin up to 0.9.1.1 on WordPress. This affects the function prepare_form. The manipulation with an unknown input leads to a remote code execution vulnerability. CWE is classifying the issue as CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The Advanced Custom Fields: Extended plugin for WordPress is vulnerable to Remote Code Execution in versions 0.9.0.5 through 0.9.1.1 via the prepare_form() function. This is due to the function accepting user input and then passing that through call_user_func_array(). This makes it possible for unauthenticated attackers to execute arbitrary code on the server, which can be leveraged to inject backdoors or create new administrative user accounts.

The advisory is shared at wordfence.com. This vulnerability is uniquely identified as CVE-2025-13486. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/04/2025). MITRE ATT&CK project uses the attack technique T1059 for this issue.

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

The vulnerability is also documented in the databases at CNNVD (CNNVD-202512-415) and EUVD (EUVD-2025-200730). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Name

• Advanced Custom Fields Plugin

Version

• 0.9.1.0
• 0.9.1.1

CPE 2.3info

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CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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