{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-53674: BuddyPress 14.4.0 REGEXP Injection via @Mention Username Resolution","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-53674","status":"final","version":"1","initial_release_date":"2026-06-09T23:44:21.471Z","current_release_date":"2026-06-10T16:32:21.733Z","revision_history":[{"date":"2026-06-09T23:44:21.471Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-53674 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-53674"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-53674"},{"category":"external","summary":"buddypress.org","url":"https://buddypress.org/"},{"category":"external","summary":"wordpress.org","url":"https://wordpress.org/plugins/buddypress/"},{"category":"external","summary":"VulnCheck Advisory: BuddyPress 14.4.0 REGEXP Injection via @Mention Username Resolution","url":"https://www.vulncheck.com/advisories/buddypress-regexp-injection-via-mention-username-resolution"}]},"product_tree":{"branches":[{"category":"vendor","name":"BuddyPress","branches":[{"category":"product_name","name":"BuddyPress","branches":[{"category":"product_version_range","name":"<=14.4.0","product":{"name":"BuddyPress BuddyPress <=14.4.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:buddypress:buddypress:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-53674","title":"BuddyPress 14.4.0 REGEXP Injection via @Mention Username Resolution","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N","baseScore":7.1,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}