Account takeover via improperly trusted SSO identities
Published Aug 1, 2026 · Updated Aug 1, 2026
Authentication bypass in Better Auth SSO Plugin before 1.6.21 or 1.7.0-beta.0 through 1.7.0-beta.9 allows attackers to take over accounts. Provider-domain parsers disagree on trusted hosts, deletion leaves reusable linked accounts, and SAML handling omits audience binding and permits active logout URL schemes. Self-service provider registration and implicit account linking expose the first three paths; the XSS path requires single logout and victim interaction.
Summary
What happened
Authentication bypass in Better Auth SSO Plugin before 1.6.21 or 1.7.0-beta.0 through 1.7.0-beta.9 allows attackers to take over accounts. Provider-domain parsers disagree on trusted hosts, deletion leaves reusable linked accounts, and SAML handling omits audience binding and permits active logout URL schemes. Self-service provider registration and implicit account linking expose the first three paths; the XSS path requires single logout and victim interaction.
The record
- CVE
- CVE-2026-67328
- Published
- Aug 1, 2026
- Updated
- Aug 1, 2026
- Vendor
- Better Auth
- Product
- Better Auth SSO Plugin
- Classifications
- CWE-347, CWE-459, CWE-287, CWE-345, CWE-79, T1078, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 1, 2026CVE publishedPublication date reported by the CVE source.
- Aug 1, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <1.6.21
- Affected versionversion=1.7.0-beta.0 <1.7.0-beta.10
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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