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CVE-2026-67328

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

Published: Aug 1, 2026Updated: Aug 3, 2026 Sources: CVE List NVDCWE-79
8.1HIGH
NVD MITRE
EPSS Score
0.3%
Top 79.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

better-auth
oss-projectaka better auth
ssoLibrary
OSS Libraries / web-framework

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://github.com/better-auth/better-auth/security/advisories/GHSA-prpr-5gj3-qqhg
github.com
https://www.vulncheck.com/advisories/better-auth-sso-before-account-takeover-via-sso
vulncheck.com

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