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CVE-2026-67332— @better-auth/oauth-provider before 1.7.0-beta.4 Authorization Bypass

Quick assessment

Affected
better-auth oauth-provider
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 1.7.0-beta.4之前版本存在授权问题漏洞，该漏洞源于访问令牌受众未与授权授权绑定，攻击者可完成OAuth流程获取无关资源令牌，绕过预期授权边界。

CVSS 6.4 · Medium EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 2

VendorProduct Version RangeStatus
better-auth oauth-provider 1.4.8< 1.7.0-beta.4 affected
1.7.0-beta.4 unaffected
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I. Basic Information for CVE-2026-67332

Vulnerability Information
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Vulnerability Title
@better-auth/oauth-provider before 1.7.0-beta.4 Authorization Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
@better-auth/oauth-provider before 1.7.0-beta.4 fails to bind access-token audience to the authorization grant, allowing clients to request tokens for unrelated resources. Attackers can complete an OAuth flow and obtain access tokens whose audience targets resource servers the authorization never covered, bypassing intended authorization boundaries.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
better-auth 授权问题漏洞
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 1.7.0-beta.4之前版本存在授权问题漏洞，该漏洞源于访问令牌受众未与授权授权绑定，攻击者可完成OAuth流程获取无关资源令牌，绕过预期授权边界。
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 oauth-provider 1.4.8 ~ 1.7.0-beta.4 -

II. Public POCs for CVE-2026-67332

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III. Intelligence Information for CVE-2026-67332

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Vendor Advisories for CVE-2026-67332 (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-2026-67328 8.1 HIGH @better-auth/sso before 1.6.21 Account Takeover via SSO
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-2026-67335 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 vendor: better-auth
Same weakness: CWE-285

V. Comments for CVE-2026-67332

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