{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-48612: Improper state verification in the OAuth implementation could allow an attacker to manipulate the authentication flow and cause a victim’s account to be linked to an attacker-controlled account","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-48612","status":"final","version":"1","initial_release_date":"2026-06-12T02:27:43.506Z","current_release_date":"2026-06-12T14:35:26.012Z","revision_history":[{"date":"2026-06-12T02:27:43.506Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Improper state verification in the OAuth implementation could allow an attacker to manipulate the authentication flow and cause a victim’s account to be linked to an attacker-controlled account. This can result in unauthorized account linking and potential account takeover.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-48612 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-48612"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-48612"},{"category":"external","summary":"phpbb.com","url":"https://www.phpbb.com/community/viewtopic.php?t=2672170"}]},"product_tree":{"branches":[{"category":"vendor","name":"phpBB","branches":[{"category":"product_name","name":"phpBB","branches":[{"category":"product_version_range","name":">=3.3.0 <=3.3.16","product":{"name":"phpBB phpBB >=3.3.0 <=3.3.16","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:phpbb:phpbb:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-48612","title":"Improper state verification in the OAuth implementation could allow an attacker to manipulate the authentication flow and cause a victim’s account to be linked to an attacker-controlled account","notes":[{"category":"description","text":"Improper state verification in the OAuth implementation could allow an attacker to manipulate the authentication flow and cause a victim’s account to be linked to an attacker-controlled account. This can result in unauthorized account linking and potential account takeover.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.0","vectorString":"CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H","baseScore":8,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}