What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.1 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 2026-07-23
• Weakness: CWE-943

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

• BuddyPress: through 14.4.0

References

• https://buddypress.org/
• https://wordpress.org/plugins/buddypress/
• https://www.vulncheck.com/advisories/buddypress-regexp-injection-via-mention-username-resolution

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