CVE-2025-71404— better-auth before 1.1.16 Reflected XSS via error parameter
Quick assessment
Affected
better-auth better-auth
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 v0.0.2之后版本和1.1.16之前版本存在跨站脚本漏洞，该漏洞源于/api/auth/error页面中'error' URL参数的值未经适当中和就被反射为HTML，可能导致攻击者诱使用户访问特制URL，在用户浏览器环境中执行任意JavaScript。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by CompromiseAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| better-auth | better-auth | < 1.1.16 |
affected |
1.1.16 |
unaffected |
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I. Basic Information for CVE-2025-71404
Vulnerability Information
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Vulnerability Title
better-auth before 1.1.16 Reflected XSS via error parameter
Source: CVE Program / CVE List V5
Vulnerability Description
better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting (XSS) vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a specially-crafted URL can execute arbitrary JavaScript in the context of the user's browser. The issue is fixed in version 1.1.16.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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 v0.0.2之后版本和1.1.16之前版本存在跨站脚本漏洞，该漏洞源于/api/auth/error页面中'error' URL参数的值未经适当中和就被反射为HTML，可能导致攻击者诱使用户访问特制URL，在用户浏览器环境中执行任意JavaScript。
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 ~ 1.1.16 | - |
|
II. Public POCs for CVE-2025-71404
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2025-71404 (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-2026-67332 | 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-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
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-
CVE-2025-71401
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CVE-2026-67327
better-auth before 1.6.22 Account Takeover via Magic-Link Em -
CVE-2026-67333
better-auth before 1.6.13 Stored XSS via javascript redirect
Same vendor: better-auth
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CVE-2025-71401
better-auth before 1.4.2 basePath Modification DoS -
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Same weakness: CWE-79
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