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CVE-2026-109346— better-auth 1.3.8-beta.3 before 1.7.0-rc.3 Device Authorization Phishing via /device

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.

在 better-auth 版本从 1.3.8-beta.3 到 1.7.0-rc.3 之间存在一个 UI 表示漏洞，该漏洞出现在 deviceAuthorization 插件中，因为 GET /device 接口缺少请求的 client_id 和 scope 信息。攻击者可以通过 /device/code 发起设备请求，诱导已登录用户批准该代码，然后在 /device/token 处兑换该代码，从而获取一个有效的会话令牌。

CVSS 8.1 · High EPSS 0.28% · P19

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token

Affected Version Matrix 2

VendorProduct Version RangeStatus
better-auth better-auth 1.3.8-beta.3< 1.7.0-rc.3 affected
1.7.0-rc.3 unaffected
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I. Basic Information for CVE-2026-109346

Vulnerability Information
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Vulnerability Title
better-auth 1.3.8-beta.3 before 1.7.0-rc.3 Device Authorization Phishing via /device
Source: CVE Program / CVE List V5
Vulnerability Description
better-auth from 1.3.8-beta.3 before 1.7.0-rc.3 contains a UI misrepresentation vulnerability in the deviceAuthorization plugin because GET /device omits the requesting client_id and scope. Attackers can start a device request via /device/code, trick signed-in users into approving the code, then redeem it at /device/token for a live session token.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键信息的UI错误表达
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
better-auth better-auth 1.3.8-beta.3 ~ 1.7.0-rc.3 -

II. Public POCs for CVE-2026-109346

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III. Intelligence Information for CVE-2026-109346

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Vendor Advisories for CVE-2026-109346 (2)

IV. Related Vulnerabilities

Same product: better-auth
Same vendor: better-auth
Same weakness: CWE-451

V. Comments for CVE-2026-109346

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