Vulnerability · Published Jun 9, 2026 · Assigned by VulnCheck

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

High 7.1

In plain English

A high-severity security flaw in BuddyPress from BuddyPress. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities).

Severity (CVSS 3.1)7.1High

Exploit odds (30 days)0.4%top 69.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
BuddyPress	BuddyPress	0 – through 14.4.0

Weakness: CWE-943 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H

References

https://buddypress.org/ product
https://wordpress.org/plugins/buddypress/ product
VulnCheck Advisory: BuddyPress 14.4.0 REGEXP Injection via @Mention Username Resolution third-party-advisory