CVE-2026-67334— better-auth Stale Sessions Persist After User Deletion
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 1.6.11之前版本存在资源管理错误漏洞，该漏洞源于在配置secondaryStorage且storeSessionInDatabase为false时，通过admin、anonymous或SCIM端点删除用户时未能删除缓存的会话，可能导致攻击者重用已删除用户的会话令牌，在账户删除后长达七天内维持身份验证。
Possible ATT&CK Techniques 1 AI
T1078 · Valid AccountsAffected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| better-auth | better-auth | 0.3.4< 1.6.11 |
affected |
1.6.11 |
unaffected | ||
1.6.0< 1.6.11 |
affected | ||
1.6.11 |
unaffected |
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I. Basic Information for CVE-2026-67334
Vulnerability Information
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Vulnerability Title
better-auth Stale Sessions Persist After User Deletion
Source: CVE Program / CVE List V5
Vulnerability Description
better-auth versions before 1.6.11 fail to delete cached sessions when removing users via admin, anonymous, or SCIM endpoints when secondaryStorage is configured and storeSessionInDatabase is false. Attackers can reuse deleted user session tokens to maintain authentication for up to seven days after account deletion.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
清理环节不完整
Source: CVE Program / CVE List V5
Vulnerability Title
better-auth 资源管理错误漏洞
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 1.6.11之前版本存在资源管理错误漏洞，该漏洞源于在配置secondaryStorage且storeSessionInDatabase为false时，通过admin、anonymous或SCIM端点删除用户时未能删除缓存的会话，可能导致攻击者重用已删除用户的会话令牌，在账户删除后长达七天内维持身份验证。
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 | 0.3.4 ~ 1.6.11 | - |
|
| better-auth | better-auth | 1.6.0 ~ 1.6.11 | - |
|
II. Public POCs for CVE-2026-67334
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-67334 (2)
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-
🔗 better-auth Stale Sessions Persist After User Deletion | Advisories | VulnCheck third-party-advisory
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-2025-71404 | 5.1 MEDIUM | better-auth before 1.1.16 Reflected XSS via error parameter |
| CVE-2025-71402 | 2.0 LOW | better-auth before 1.4.0 Session Revocation via Forged Cookie |
IV. Related Vulnerabilities
Same product: better-auth
-
CVE-2025-71401
better-auth before 1.4.2 basePath Modification DoS -
CVE-2025-71399
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CVE-2026-67337
better-auth before 1.4.9 Two-Factor Authentication Bypass vi -
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
-
CVE-2026-80192
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CVE-2025-71401
better-auth before 1.4.2 basePath Modification DoS -
CVE-2025-71400
better-auth passkey before 1.4.0 IDOR via delete-passkey -
CVE-2025-71399
Better Auth before 1.4.5 Path Normalization Bypass via rou3 -
CVE-2026-67327
better-auth before 1.6.22 Account Takeover via Magic-Link Em
Same weakness: CWE-459
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