CVE-2026-53674: Buddypress

High severity, CVSS 7.1. EPSS: 0.7% chance of exploitation in the next 30 days.

BuddyPress 14.4.0 contains a regular expression injection vulnerability in the activity mention resolver that, when username compatibility mode is enabled, allows attackers to manipulate a REGEXP database clause by crafting mention names containing regex metacharacters. Attackers can submit @mentions whose metacharacters pass through esc_sql unescaped and are inserted into an unprepared REGEXP query against the users table, enabling boolean-based inference of usernames and denial of service through catastrophic backtracking.

Affected products

• Buddypress Buddypress: up to and including 14.4.0

Published 2026-06-10. Last modified 2026-07-23.