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CVE-2026-2839

5.3 medium Deferred
NVD · CVE.org

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.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 4

  1. StatusPublished → DeferredNVD modified 2026-10-28 13:46
  2. StatusReceived → PublishedNVD modified 2026-10-28 06:45
  3. StatusPublished → ReceivedNVD modified 2026-10-28 07:16
  4. First seenCVSS 5.3 · hwk-frNVD modified 2026-10-28 06:45

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 7