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CVE-2026-45337— Better Auth: Device authorization approve and deny accept any authenticated session while the user code is pending

CVSS 7.6 · High EPSS 0.14% · P4

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
better-authbetter-auth>= 1.6.0, < 1.6.11affected
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I. Basic Information for CVE-2026-45337

Vulnerability Information
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Vulnerability Title
Better Auth: Device authorization approve and deny accept any authenticated session while the user code is pending
Source: CVE Program / CVE List V5
Vulnerability Description
Better Auth is an authentication and authorization library for TypeScript. From 1.6.0 until 1.6.11, the deviceAuthorization plugin treats any authenticated session as the owner of any pending device code because GET /device does not claim the row and POST /device/approve and POST /device/deny short-circuit when userId is unset, allowing an authenticated attacker who learns a valid user_code to bind the polling device to the attacker's account or deny the legitimate flow. This issue is fixed in version 1.6.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
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 better-auth是better-auth的防病毒反病毒产品。 Better Auth 1.6.0版本至1.6.11之前版本存在安全漏洞，该漏洞源于deviceAuthorization插件中GET /device未声明行且POST /device/approve和POST /device/deny在userId未设置时短路，允许已认证的攻击者在获知有效user_code后将轮询设备绑定至攻击者账户或阻止合法流程。
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

VendorProductAffected VersionsCPESubscribe
better-authbetter-auth >= 1.6.0, < 1.6.11 -

II. Public POCs for CVE-2026-45337

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9424 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-45337

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Patches & Fixes for CVE-2026-45337 (2)

Vendor Advisories for CVE-2026-45337 (1)

Vendor Pages for CVE-2026-45337 (1)

Same Patch Batch · better-auth · 2026-07-15 · 8 CVEs total

CVE-2026-535139.6 CRITICALBetter Auth: Server-side request forgery via unvalidated OIDC endpoints on @better-auth/ss
CVE-2026-535168.3 HIGHBetter Auth: Account takeover via OAuth auto-link to unverified pre-registered email
CVE-2026-535178.1 HIGHBetter Auth OAuth Provider: Refresh Token Rotation Race Condition Allows Concurrent Replay
CVE-2026-535147.7 HIGHBetter Auth: Unauthorized invitation acceptance via unverified email match in organization
CVE-2026-535157.1 HIGHBetter Auth: Privilege escalation via SSO provider registration: missing admin role check
CVE-2026-53518Better Auth OAuth Provider: Race Condition in Authorization Code Exchange Enables Multi-Us
CVE-2026-53512Better Auth: OAuth refresh-token replay via missing client authentication on oidc-provider

IV. Related Vulnerabilities

Same product: better-auth
Same vendor: better-auth
Same weakness: CWE-285

V. Comments for CVE-2026-45337

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