CVE-2026-48612

EUVD-2026-36380
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.
CSRF
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
hackeroneCNA
8 HIGH
NETWORK
HIGH
LOW
CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
phpbbphpbb
3.3.0 ≤
𝑥
≤ 3.3.16
CNA
Common Weakness Enumeration
References
https://www.phpbb.com/community/viewtopic.php?t=2672170