CVE-2026-53673: BuddyPress 14.4.0 Private Message IDOR via REST API user_id Parameter

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-10 · updated 2026-10-08
Weakness: CWE-639

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.

Affected products

BuddyPress: through 14.4.0

References

https://buddypress.org/
https://wordpress.org/plugins/buddypress/
https://www.vulncheck.com/advisories/buddypress-private-message-idor-via-rest-api-user-id-parameter

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