CVE-2026-67337 better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache

better-auth versions before 1.4.9 contain a two-factor authentication bypass vulnerability when session.cookieCache is enabled. Attackers with valid primary credentials can access authenticated routes without completing second-factor verification by exploiting premature session caching...

CVE-2026-67335

Affected software: better-auth before 1.6.2. Vulnerability: OAuth state validation failure due to cookie-backed state storage without PKCE, allowing attackers to forge the state and supply an attacker-controlled authorization code. Impact: can create authenticated sessions bound to the attacker's...

CVE-2026-67335 better-auth before 1.6.2 OAuth State Validation Bypass

better-auth versions before 1.6.2 fail to validate the OAuth state parameter against the stored nonce when using cookie-backed state storage without PKCE. Attackers can forge the state parameter and supply an attacker-controlled authorization code to create authenticated sessions bound to the...

CVE-2026-67331

CVE-2026-67331 affects better-auth SCIM, versions 1.5.0 up to but not including 1.7.0-beta.4. The vulnerability arises because non-organization SCIM providers are not bound to their creator by default, enabling an authenticated user to manage other users’ providers. Attackers can regenerate SCIM ...

CVE-2026-67327

better-auth versions = 1.1.3 and = 1.7.0-beta.0 and 1.7.0-beta.10 are vulnerable to account takeover via pre-account hijacking on magic-link and email-OTP sign-in when open email/password registration is enabled. An attacker registers an account with the victim's email address and an...

CVE-2025-71404

better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting XSS vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a...

EUVD-2026-51841

better-auth versions = 1.1.3 and = 1.7.0-beta.0 and 1.7.0-beta.10 are vulnerable to account takeover via pre-account hijacking on magic-link and email-OTP sign-in when open email/password registration is enabled. An attacker registers an account with the victim's email address and an...

CVE-2025-71404 better-auth before 1.1.16 Reflected XSS via error parameter

better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting XSS vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a...

CVE-2025-71404 better-auth before 1.1.16 Reflected XSS via error parameter

better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting XSS vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a...

CVE-2025-71404 better-auth before 1.1.16 Reflected XSS via error parameter

better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting XSS vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a...

CVE-2026-67314 axios before 1.18.0 Prototype Pollution via auth subfields

axios versions =1.15.2 and 1.18.0 contain prototype-pollution read-side gadgets in Basic auth subfield handling lib/adapters/http.js and lib/helpers/resolveConfig.js. When an application is already affected by a separate prototype-pollution primitive and makes an axios request with an own auth...

CVE-2025-71402 better-auth before 1.4.0 Session Revocation via Forged Cookie

better-auth versions greater than 1.3.34 and before 1.4.0 contain a vulnerability in the multi-session plugin's /sign-out after-hook, which trusts raw multi-session cookies and forwards extracted values to internalAdapter.deleteSessions without verifying the cookie signature e.g., via...

CVE-2026-67314 axios before 1.18.0 Prototype Pollution via auth subfields

axios versions =1.15.2 and 1.18.0 contain prototype-pollution read-side gadgets in Basic auth subfield handling lib/adapters/http.js and lib/helpers/resolveConfig.js. When an application is already affected by a separate prototype-pollution primitive and makes an axios request with an own auth...

CVE-2025-71402

The CVE affects better-auth versions >1.3.34 and

CVE-2026-67330

The CVE affects @better-auth/scim (the better-auth SCIM plugin). Versions 1.4.0-beta.27 through 1.6.21 and 1.7.0-beta.0 through 1.7.0-beta.9 contain an authorization bypass caused by SCIM token issuance using provider IDs that collide with existing SSO/SAML/OIDC/generic OAuth/social provider name...

CVE-2025-71402 better-auth before 1.4.0 Session Revocation via Forged Cookie

better-auth versions greater than 1.3.34 and before 1.4.0 contain a vulnerability in the multi-session plugin's /sign-out after-hook, which trusts raw multi-session cookies and forwards extracted values to internalAdapter.deleteSessions without verifying the cookie signature e.g., via...

CVE-2026-67314

axios versions =1.15.2 and 1.18.0 contain prototype-pollution read-side gadgets in Basic auth subfield handling lib/adapters/http.js and lib/helpers/resolveConfig.js. When an application is already affected by a separate prototype-pollution primitive and makes an axios request with an own auth...

CVE-2026-67314

CVE-2026-67314 affects axios versions >=1.15.2 and

CVE-2025-71403: URL Redirection to Untrusted Site

better-auth versions before 1.1.20 contain a bypass vulnerability in trustedOrigins validation logic affecting absolute URLs and wildcard domains. Attackers can construct malicious callbackURL parameters that pass origin checks and trigger open redirects to steal sensitive tokens for account...

CVE-2025-71404: Improper Neutralization of Input During Web Page Generation

better-auth versions after v0.0.2 and before 1.1.16 contain a reflected cross-site scripting XSS vulnerability on the /api/auth/error page, where the value of the 'error' URL parameter is reflected as HTML without proper neutralization. An attacker who coerces a user into visiting a...