CVE-2026-53674 – BuddyPress 14.4.0 REGEXP Injection via @Mention Username Resolution

CVE ID :CVE-2026-53674

Published : June 10, 2026, 12:16 a.m. | 20 minutes ago

Description :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.

Severity: 7.1 | HIGH

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