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CVE-2026-67333— better-auth before 1.6.13 Stored XSS via javascript redirect_uri

Quick assessment

Affected
better-auth better-auth
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 1.6.13之前版本存在跨站脚本漏洞，该漏洞源于通过已弃用的oidc-provider插件和mcp插件注册的redirect_uris缺少scheme验证，可能导致攻击者注册包含javascript:的redirect_uri，在授权服务器源中执行恶意JavaScript，从而暴露用户会话并导致账户接管。

CVSS 7.2 · High EPSS 0.26% · P17

Affected Version Matrix 4

VendorProduct Version RangeStatus
better-auth better-auth < 1.6.13 affected
1.6.13 unaffected
1.7.0-beta.0< 1.7.0-beta.4 affected
1.7.0-beta.4 unaffected
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I. Basic Information for CVE-2026-67333

Vulnerability Information
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Vulnerability Title
better-auth before 1.6.13 Stored XSS via javascript redirect_uri
Source: CVE Program / CVE List V5
Vulnerability Description
better-auth before 1.6.13 (and pre-release builds 1.7.0-beta.0 through 1.7.0-beta.3) fail to validate the scheme of redirect_uris registered via the deprecated oidc-provider plugin and the mcp plugin (which wraps the same provider). An attacker can register an OAuth client with a javascript: redirect_uri, which the authorization server later returns unchanged in the consent response. If the deployment's consent page navigates the browser to the returned redirectURI (e.g. assigning it to window.location.href), the attacker's JavaScript executes in the authorization-server origin, exposing the victim's session and enabling account takeover.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/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 1.6.13之前版本存在跨站脚本漏洞，该漏洞源于通过已弃用的oidc-provider插件和mcp插件注册的redirect_uris缺少scheme验证，可能导致攻击者注册包含javascript:的redirect_uri，在授权服务器源中执行恶意JavaScript，从而暴露用户会话并导致账户接管。
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 better-auth 0 ~ 1.6.13 -
better-auth better-auth 1.7.0-beta.0 ~ 1.7.0-beta.4 -

II. Public POCs for CVE-2026-67333

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8198 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-67333

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Vendor Advisories for CVE-2026-67333 (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-2026-67329 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: better-auth
Same vendor: better-auth
Same weakness: CWE-79

V. Comments for CVE-2026-67333

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