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CVE-2026-2839— Advanced Custom Fields: Extended <= 0.9.2.7 - Missing Authorization to Unauthenticated Data Exposure via Multiple AJAX Endpoints

Quick assessment

Affected
hwk-fr Advanced Custom Fields: Extended
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress 插件"Advanced Custom Fields: Extended"在所有 0.9.2.7 及更早版本中均存在漏洞，允许未授权用户访问数据并触发服务器端操作。该漏洞的成因是：插件为未认证用户注册了多个 AJAX 处理器（ ），但这些处理器未能正确实施 权限检查。尽管这些处理器使用了 ACF 的 函数来验证加密 nonce，但 值是为访客用户生成的，并公开暴露在任何使用了 ACF 表单的前端页面的页面源代码中。这使得未认证的攻击者能够提取访客 nonce，从而绕过 WordPress 的可见性

CVSS 5.3 · Medium
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I. Basic Information for CVE-2026-2839

Vulnerability Information
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Vulnerability Title
Advanced Custom Fields: Extended <= 0.9.2.7 - Missing Authorization to Unauthenticated Data Exposure via Multiple AJAX Endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
The Advanced Custom Fields: Extended plugin for WordPress is vulnerable to unauthorized access of data and triggering of server-side actions in all versions up to, and including, 0.9.2.7. This is due to multiple AJAX handlers registered for unauthenticated users (`wp_ajax_nopriv_*`) that fail to implement proper `current_user_can()` authorization checks. While these handlers use ACF's `acf_verify_ajax()` function to validate cryptographic nonces, the `acf_nonce` values are generated for guest users and publicly exposed in the page source of any frontend page utilizing an ACF form. This makes it possible for unauthenticated attackers to extract the guest nonce and bypass WordPress visibility permissions, leading to the unauthorized disclosure of post titles and internal Flexible Content layout structures. The vulnerability was partially patched in version 0.9.2.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
hwk-fr Advanced Custom Fields: Extended 0 ~ 0.9.2.7 -

II. Public POCs for CVE-2026-2839

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III. Intelligence Information for CVE-2026-2839

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Other References for CVE-2026-2839 (7)

IV. Related Vulnerabilities

Same product: Advanced Custom Fields: Extended
Same vendor: hwk-fr
Same weakness: CWE-862