Vulnerability in Buddypress
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (49.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 49.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.007 · change: +0.003
Affected products
- Buddypress — versions 0
Weakness classification (CWE)
References
- buddypress.org/ (product)
- wordpress.org/plugins/buddypress/ (product)
- www.vulncheck.com/advisories/buddypress-regexp-injection-via-mention-username-r… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-53674?
- CVE-2026-53674 is a high-severity vulnerability in Buddypress, classified under Improper Neutralization of Special Elements in Data Query Logic. CVSS score: 7.1/10. Published 2026-06-10.
- How severe is CVE-2026-53674?
- High severity. CVSS v3 base score is 7.1 out of 10.