Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-121802

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 1.7.16 之前的版本中，由于服务器在签署由调用方提供的状态值时，未验证该值是否由服务器签发，因此可能导致账户接管风险（例如，攻击者可未经认证地修改任意账户的邮箱地址）。注意：在升级到已修复的版本后，必须轮换应用程序密钥（application secret）。

CVSS 9.1 · Critical

Possible ATT&CK Techniques 1 AI

T1552 · Unsecured Credentials
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-121802

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
@better-auth/expo before 1.7.16 allows certain account-takeover outcomes (e.g., unauthenticated changes of any account's email address), because it signs a caller-supplied state value without checking whether that value had been issued by the server. NOTE: the application secret must be rotated after updating to a fixed version.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
better-auth Better Auth 0 ~ 1.7.16 -

II. Public POCs for CVE-2026-121802

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-121802

请登录查看更多情报信息。

Other References for CVE-2026-121802 (3)

IV. Related Vulnerabilities

Same vendor: better-auth
Same weakness: CWE-346