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

7.1HIGH

Key Information:

Vendor

Buddypress

Status
Buddypress
Vendor
CVE Published:
9 June 2026

What is CVE-2026-53674?

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 Version(s)

BuddyPress 0 <= 14.4.0

References

https://buddypress.org/
product
https://wordpress.org/plugins/buddypress/
product
https://www.vulncheck.com/advisories/buddypress-regexp-in...
third-party-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
Low
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Scott Moore - VulnCheck
.