CVE-2026-48612

Improper OAuth State Verification Allows Account Takeover

Published Jun 12, 2026 CVSS 3.0 · 8 High EPSS < 1% KEV · Not listed
Description
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Phpbb
Phpbb phpbb
Vendors & Products Phpbb
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Title Improper OAuth State Verification Allows Account Takeover
Type Values Removed Values Added
Description 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.
Weaknesses CWE-352
References
Metrics cvssV3_0

{'score': 8, 'vector': 'CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
hackerone
Published
Updated
Jun 12, 2026, 2:35 PM
Reserved
May 22, 2026, 3:00 PM
Status
Deferred
Published
Jun 12, 2026, 4:17 AM
Modified
Jun 17, 2026, 10:55 AM