CVE-2026-3906 WordPress 6.9 - 6.9.1 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Note Creation via REST API
Authenticated subscribers can create arbitrary notes on any post via the REST API due to missing permission checks in WordPress core.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-3906?
CVE-2026-3906 is a medium-severity missing authorization vulnerability in WordPress, published on 11 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-862
Which versions are affected by CVE-2026-3906?
2 open source packages ship an affected version, including wordpress and wordpress-multisite.
| Package | Affected | Fixed in |
|---|---|---|
wordpress Bitnami | From 6.9.0 | 6.9.2 |
wordpress-multisite Bitnami | From 6.9.0 | 6.9.2 |
How do I fix CVE-2026-3906?
Upgrade wordpress to 6.9.2 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-3906 being exploited?
There is no known exploitation of CVE-2026-3906 in the wild and no public exploit code.
Sources
Also known as BIT-wordpress-2026-3906, BIT-wordpress-multisite-2026-3906, DEBIAN-CVE-2026-3906, GHSA-6x83-fcf5-r65g, MINI-jrj6-w9x2-qr4p, UBUNTU-CVE-2026-3906.