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CVE-2026-67328— @better-auth/sso before 1.6.21 Account Takeover via SSO

Quick assessment

Affected
better-auth sso
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

better-auth是better-auth团队开源的一个身份验证框架。 better-auth 1.6.21之前版本存在跨站脚本漏洞，该漏洞源于SSO提供商处理存在多个身份验证绕过问题，包括域验证解析不匹配、孤立提供商账户、未绑定SAML断言或注销端点上的反射型跨站脚本，可能导致攻击者以任意用户身份登录，获取未授权会话访问和账户接管。

CVSS 8.1 · High EPSS 0.49% · P40

Affected Version Matrix 4

VendorProduct Version RangeStatus
better-auth sso < 1.6.21 affected
1.6.21 unaffected
1.7.0-beta.0< 1.7.0-beta.10 affected
1.7.0-beta.10 unaffected
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I. Basic Information for CVE-2026-67328

Vulnerability Information
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Vulnerability Title
@better-auth/sso before 1.6.21 Account Takeover via SSO
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
better-auth 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
better-auth是better-auth团队开源的一个身份验证框架。 better-auth 1.6.21之前版本存在跨站脚本漏洞，该漏洞源于SSO提供商处理存在多个身份验证绕过问题，包括域验证解析不匹配、孤立提供商账户、未绑定SAML断言或注销端点上的反射型跨站脚本，可能导致攻击者以任意用户身份登录，获取未授权会话访问和账户接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
better-auth sso 0 ~ 1.6.21 -
better-auth sso 1.7.0-beta.0 ~ 1.7.0-beta.10 -

II. Public POCs for CVE-2026-67328

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 9752 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-67328

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Vendor Advisories for CVE-2026-67328 (2)

Same Patch Batch · better-auth · 2026-08-01 · 14 CVEs total

CVE-2026-67330 9.9 CRITICAL better-auth SCIM 1.4.0-beta.27 through 1.6.21 Account Takeover via Provider-ID Collision
CVE-2026-67336 8.7 HIGH better-auth before 1.6.11 Insecure Cryptographic Defaults via oidcProvider
CVE-2026-67327 8.3 HIGH better-auth before 1.6.22 Account Takeover via Magic-Link Email-OTP
CVE-2026-67331 8.3 HIGH better-auth SCIM 1.5.0 before 1.7.0-beta.4 Authorization Bypass
CVE-2026-67333 7.2 HIGH better-auth before 1.6.13 Stored XSS via javascript redirect_uri
CVE-2026-67329 7.1 HIGH @better-auth/stripe before 1.6.21 Authorization Bypass via Organization Subscription
CVE-2025-71403 7.1 HIGH better-auth before 1.1.20 Open Redirect via trustedOrigins Bypass
CVE-2026-67337 6.5 MEDIUM better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache
CVE-2026-67332 6.4 MEDIUM @better-auth/oauth-provider before 1.7.0-beta.4 Authorization Bypass
CVE-2026-67335 5.3 MEDIUM better-auth before 1.6.2 OAuth State Validation Bypass
CVE-2025-71404 5.1 MEDIUM better-auth before 1.1.16 Reflected XSS via error parameter
CVE-2026-67334 3.8 LOW better-auth Stale Sessions Persist After User Deletion
CVE-2025-71402 2.0 LOW better-auth before 1.4.0 Session Revocation via Forged Cookie

IV. Related Vulnerabilities

Same product: sso
Same vendor: better-auth
Same weakness: CWE-79

V. Comments for CVE-2026-67328

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