EUVD-2026-66214

@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 organizati...

CVE-2026-80192

@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 organizati...

Time-of-check Time-of-use (TOCTOU) Race Condition

Overview @better-auth/sso is a SSO plugin for Better Auth Affected versions of this package are vulnerable to Time-of-check Time-of-use TOCTOU Race Condition through the verifyDomain route in packages/sso/src/routes/domain-verification.ts and the domain-based assignment logic in...

@arxen/sso (0.2.0), @inkeep/agents-api (>=0.0.0-dev-20260121145510, <=0.80.6) +17 more potentially affected by CVE-2026-80192 via @better-auth/sso (>=1.4.10, <=1.6.26)

@better-auth/sso NPM version =1.4.10, =0.0.0-dev-20260121145510, =0.0.0-chat-to-edit-20251119071712, =0.0.0-dev-20260106221934, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-dev-20260203033642...

CVE-2026-80192: Improper Authentication

@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 organizati...

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

@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 organizati...

CVE-2026-80192

@better-auth/sso contains two domain-ownership authentication bypass flaws affecting versions before 1.6.27 (and before 1.4.8 in the 1.4.x line, before 1.7.0-rc.5 in the 1.7 prerelease line). When domain verification is disabled , an authenticated organization owner/administrator can register an ...

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

@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 organizati...

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

@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 organizati...

PT-2026-81905

Name of the Vulnerable Software and Affected Versions @better-auth/sso versions prior to 1.4.8 @better-auth/sso versions prior to 1.6.27 @better-auth/sso versions prior to 1.7.0-rc.5 Description Two domain-ownership flaws exist when the SSO plugin is active. If domain verification is disabled,...

@inkeep/agents-api (>=0.0.0-dev-20260121145510, <=0.80.6), @inkeep/agents-cli (>=0.0.0-chat-to-edit-20251119071712, <=0.80.6) +16 more potentially affected by CVE-2026-67328 via @better-auth/sso (>=1.3.28, <=1.6.20)

@better-auth/sso NPM version =1.3.28, =0.0.0-dev-20260121145510, =0.0.0-chat-to-edit-20251119071712, =0.0.0-dev-20260106221934, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-dev-20260203033642...

CVE-2026-67328: Improper Neutralization of Input During Web Page Generation

@better-auth/sso versions before 1.6.21 contain multiple authentication bypass vulnerabilities in SSO provider handling that allow attackers to sign in as arbitrary users. Attackers can exploit domain verification parsing mismatches, orphaned provider accounts, unbound SAML assertions, or reflect...

@inkeep/agents-api (>=0.0.0-dev-20260121145510, <=0.80.6), @inkeep/agents-cli (>=0.0.0-chat-to-edit-20251119071712, <=0.80.6) +16 more potentially affected by CVE-2026-53515 via @better-auth/sso (>=1.3.28, <=1.6.9)

@better-auth/sso NPM version =1.3.28, =0.0.0-dev-20260121145510, =0.0.0-chat-to-edit-20251119071712, =0.0.0-dev-20260106221934, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-dev-20260203033642...

@inkeep/agents-api (>=0.0.0-dev-20260121145510, <=0.80.6), @inkeep/agents-cli (>=0.0.0-chat-to-edit-20251119071712, <=0.80.6) +16 more potentially affected by CVE-2026-53515 via @better-auth/sso (>=1.3.28, <=1.6.9)

@better-auth/sso NPM version =1.3.28, =0.0.0-dev-20260121145510, =0.0.0-chat-to-edit-20251119071712, =0.0.0-dev-20260106221934, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-dev-20260203033642...

CVE-2026-53515: Improper Privilege Management

Better Auth is an authentication and authorization library for TypeScript. From 1.2.10 until 1.6.11, the @better-auth/sso plugin's POST /sso/register endpoint lets any organization member attach a new SSO provider to that organization because registerSSOProvider checks only for a membership row a...

CVE-2026-53513: Improper Input Validation

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.11, the @better-auth/sso plugin's POST /sso/register and POST /sso/update-provider endpoints accept attacker-controlled oidcConfig.userInfoEndpoint, tokenEndpoint, and jwksEndpoint URLs when skipDiscovery: tru...

@inkeep/agents-api (>=0.0.0-dev-20260121145510, <=0.80.6), @inkeep/agents-cli (>=0.0.0-chat-to-edit-20251119071712, <=0.80.6) +16 more potentially affected by CVE-2026-53513 via @better-auth/sso (>=1.3.28, <=1.6.9)

@better-auth/sso NPM version =1.3.28, =0.0.0-dev-20260121145510, =0.0.0-chat-to-edit-20251119071712, =0.0.0-dev-20260106221934, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-chat-to-edit-20251119071712, =0.0.0-dev-20260203033642...

@better-auth/sso provider registration has server-side request forgery via unvalidated OIDC endpoints

Am I affected? Users are affected if all of the following are true: - Their application uses @better-auth/sso at a version = 0.1.0, 1.6.11 on the stable line, or any 1.7.0-beta.x on the pre-release line. - The sso plugin is added to their application's betterAuth plugins: ... array. - Any user wi...

PT-2026-56298

Name of the Vulnerable Software and Affected Versions @better-auth/sso versions 0.1.0 through 1.6.10 @better-auth/sso versions 1.7.0-beta.x Description An SSRF flaw exists in the provider registration flow where OpenID Connect OIDC endpoint URLs are accepted without proper validation. When...