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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/sso 1.6.27 之前版本（以及 1.4.x 分支中 1.4.8 之前版本，1.7.x 预发布分支中 1.7.0-rc.5 之前版本）存在两个域所有权验证缺陷： 1. 当域验证功能被禁用时，自动组织分配机制会接受未经验证的提供商域名。这使得经过身份认证的组织所有者或管理员可以任意注册一个 SSO 提供商，并将具有匹配邮箱域名的用户以默认成员权限添加到攻击者的组织中。 2. 当域验证功能启用时，verify-domain 接口与 update-provider 接口之间存在竞态条件，可能

CVSS 8.1 · High EPSS 0.27% · P19

Affected Version Matrix 4

VendorProduct Version RangeStatus
better-auth sso 1.4.8-beta.1< 1.4.8 affected
1.4.8 unaffected
< 1.4.9 unaffected
< 1.7.0-beta.0 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

Affected Products

Vendor Product Affected Versions CPE Subscribe
better-auth sso 1.4.8-beta.1 ~ 1.4.8 -
better-auth sso 0 ~ 1.4.9 -
better-auth sso 0 ~ 1.7.0-beta.0 -

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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