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Vulnerabilities CVE-2026-67328

CVE-2026-67328

High
Open
TLP:CLEAR

@better-auth/sso before 1.6.21 Account Takeover via SSO

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Description

@better-auth/sso versions before 1.6.21 contain multiple authentication bypass vulnerabilities in SSO provider handling that allow attackers to sign in as arbitrary users. Attackers can exploit domain verification parsing mismatches, orphaned provider accounts, unbound SAML assertions, or reflected XSS on logout endpoints to gain unauthorized session access and account takeover.

Details

CVSS Score
8.6
EPSS Score
0.28%

20.3th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Aug 1, 2026
Last Modified
Aug 3, 2026
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