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CVE-2026-80192— better-auth SSO before 1.6.27 Domain Ownership Authentication Bypass

Quick assessment

Affected
better-auth sso
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 TypeScript 最全面的身份验证框架。 Better Auth 1.6.27之前版本、1.4.8版本之前的1.4.x版本和1.7.0-rc.5版本之前的1.7 prerelease版本存在授权问题漏洞，该漏洞源于域验证禁用时自动组织分配接受未验证的provider域，以及域验证启用时verify-domain和update-provider端点之间存在竞争条件，可能导致已认证组织所有者/管理员注册任意域SSO provider并将匹配em

CVSS 8.1 · High EPSS 0.36% · P28

Affected Version Matrix 6

VendorProduct Version RangeStatus
better-auth sso 1.4.8-beta.1< 1.4.8 affected
1.4.8 unaffected
1.4.9< 1.6.27 affected
1.6.27 unaffected
1.7.0-beta.0< 1.7.0-rc.5 affected
1.7.0-rc.5 unaffected
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I. Basic Information for CVE-2026-80192

Vulnerability Information
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Vulnerability Title
better-auth SSO before 1.6.27 Domain Ownership Authentication Bypass
Source: CVE Program / CVE List V5
Vulnerability Description
@better-auth/sso before 1.6.27 (and before 1.4.8 in the 1.4.x line and before 1.7.0-rc.5 in the 1.7 prerelease line) contains two domain-ownership flaws. When domain verification is disabled, automatic organization assignment accepts unverified provider domains, allowing an authenticated organization owner/administrator to register an SSO provider for an arbitrary domain and have users with matching email domains added to the attacker's organization with default member permissions. When domain verification is enabled, a race condition between the verify-domain and update-provider endpoints can apply completed DNS proof to a different domain; combined with implicit account linking, this can link an attacker-controlled identity provider to an existing user account. Exploitation requires the SSO plugin (and, for the org-assignment path, the organization plugin) with the relevant configuration enabled.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
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是Better Auth团队开源的一个 TypeScript 最全面的身份验证框架。 Better Auth 1.6.27之前版本、1.4.8版本之前的1.4.x版本和1.7.0-rc.5版本之前的1.7 prerelease版本存在授权问题漏洞，该漏洞源于域验证禁用时自动组织分配接受未验证的provider域，以及域验证启用时verify-domain和update-provider端点之间存在竞争条件，可能导致已认证组织所有者/管理员注册任意域SSO provider并将匹配em
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 sso 1.4.8-beta.1 ~ 1.4.8 -
better-auth sso 1.4.9 ~ 1.6.27 -
better-auth sso 1.7.0-beta.0 ~ 1.7.0-rc.5 -

II. Public POCs for CVE-2026-80192

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III. Intelligence Information for CVE-2026-80192

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Vendor Advisories for CVE-2026-80192 (1)

IV. Related Vulnerabilities

Same product: sso
Same vendor: better-auth
Same weakness: CWE-287

V. Comments for CVE-2026-80192

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