6.8.10
*Release Date 10th September 2026*
- Security - ACF now validates that uploaded PDF files begin with the standard `%PDF-` header before further processing, rejecting files that do not match the expected format
- Security - The Relationship, Post Object, Image, Gallery, and File fields now enforce WordPress read permissions on referenced posts and attachments when returned in REST API responses
- Security - ACF now verifies both preview context and the caller's edit capability before substituting revision data when field values are retrieved for a post
- Security - The `_acf_form` token used by frontend forms now expires and is bound to its issuing render, and `acf_encrypt()` / `acf_decrypt()` gain an optional `$context` argument for domain separation between token uses
- Security - ACF now consistently runs field validation on frontend form submissions containing field data, ensuring required-field checks and custom `acf/validate_value` filters cannot be circumvented
- Security - ACF's REST API schema no longer discloses per-object field-group configuration in OPTIONS requests to callers who lack read permission on the target object
- Security - The User field AJAX endpoint now validates that the request nonce was created for a User field
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