CVE-2026-3906: WordPress Foundation WordPress

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

WordPress core is vulnerable to unauthorized access in versions 6.9 through 6.9.1. The Notes feature (block-level collaboration annotations) was introduced in WordPress 6.9 to allow editorial comments directly on posts in the block editor. However, the REST API `create_item_permissions_check()` method in the comments controller did not verify that the authenticated user has `edit_post` permission on the target post when creating a note. This makes it possible for authenticated attackers with Subscriber-level access to create notes on any post, including posts authored by other users, private posts, and posts in any status.

Affected products

• WordPress Foundation WordPress: from 6.9, up to and including 6.9.1

Published 2026-03-11. Last modified 2026-06-17.