WordPress security: The Advanced Custom Fields (ACF) update and its impact on site security

Article image WordPress security: The Advanced Custom Fields (ACF) update and its impact on site security
Article image WordPress security: The Advanced Custom Fields (ACF) update and its impact on site security
Publication date:24.01.2026
Blog category: SEO and Promotion

The new version of the Advanced Custom Fields (ACF) plugin for WordPress, which has more than 2 million installs, includes an important security update. Update 6.2.5 addresses a vulnerability whose details have not been fully disclosed. Although it is not known exactly what malicious actions are possible using this vulnerability, ACF recommends updating because the vulnerability can be exploited by users with Contributor privileges or higher.

"ACF 6.2.5 may introduce changes that break sites"

Update 6.2.5 makes significant changes to the handling and output of potentially dangerous HTML code via ACF shortcodes. The output will now be escaped, a process that usually removes unwanted HTML, such as malicious scripts or malformed HTML. However, this may affect sites that use shortcodes to display complex HTML elements such as scripts or iframes.

  • 📌 Update 6.2.5 provides shielding of HTML output via ACF shortcodes.
  • 📌 The vulnerability can be exploited by users with contributor rights or higher.
  • 📌 The update may affect sites that use ACF shortcodes to display complex HTML elements.
FAQ:

🔹 What changes does the 6.2.5 update bring to the ACF plugin?

Update 6.2.5 makes changes to the handling and output of potentially dangerous HTML code via ACF shortcodes.

🔹 Who can exploit the identified vulnerability?

The vulnerability could be exploited by users with Contributor privileges or higher.

🔹 Can the update affect the sites?

Yes, the update may affect sites that use ACF shortcodes to render complex HTML elements.

🧩 Summary: This WordPress plugin is used by more than 2 million sites, and its latest security update attempts to address a vulnerability that could be exploited by users with Contributor privileges or higher. Update 6.2.5 changes the way HTML is processed and output via ACF shortcodes, which may affect some sites. All ACF users are encouraged to update the plugin to version 6.2.5 immediately.
🧠 Own Considerations: Network security is an important aspect of website management. It's important to keep your plugins up to date and adapt your sites accordingly. While this update may affect some sites, user safety should be our top priority.

Comments

BugHunter Avatar
Схоже, ACF вирішив, що безпека важливіша за комфорт розробників. І так, тепер наші улюблені шорткоди можуть стати серйозною перешкодою для тих, хто взагалі не уявляє, як жити без скриптів і iframe. Класний хід! Он оновлюйтесь, а потім міркуйте, як виправити зламаний сайт. Шукай недоліки далі, бо це ще не межа.
24.01.2026 09:00 BugHunter