CVE-2026-53673 BuddyPress 14.4.0 Private Message IDOR via REST API user_id Parameter
Authenticated attackers can access, reply to, or delete arbitrary private messages by manipulating the user_id parameter in the REST API.
- 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-2026-53673?
CVE-2026-53673 is a high-severity missing authorization vulnerability in BuddyPress, published on 9 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
BuddyPress 14.4.0 contains an insecure direct object reference vulnerability in the messages REST API that allows authenticated attackers to access arbitrary private message threads by supplying a user_id parameter in the request. Attackers can pass another user's identifier to the get_item_permissions_check method, which validates the supplied user_id instead of the logged-in user and is reused by the update and delete handlers, to read, reply to, or delete any user's private messages.
Weakness: CWE-639
Which versions are affected by CVE-2026-53673?
2 open source packages ship an affected version, including buddypress/buddypress.
| Package | Affected | Fixed in |
|---|---|---|
buddypress/buddypress Packagist | All versions | 14.5.0 |
buddypress/buddypress Packagist | All versions | 14.5.0 |
How do I fix CVE-2026-53673?
Upgrade buddypress/buddypress to 14.5.0 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-53673 being exploited?
There is no known exploitation of CVE-2026-53673 in the wild and no public exploit code.
Sources
Also known as GHSA-j3j5-5m8v-7gvc.