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...

PT-2026-56297

Name of the Vulnerable Software and Affected Versions better-auth versions prior to 1.6.11 Description The legacy oidcProvider and mcp plugins expose an OAuth 2.0 token endpoint that fails to authenticate confidential clients during the refresh token grant. The system authenticates requests based...

Malicious code in @mastra/auth-better-auth (npm)

--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector b3f3ba577912ece34e70e0f5d94ee38bf681dc3f0d2a2125d0bbe95c98dbbe3a The package was found to contain malicious code or consuming dependency that contains malicious code Source: ghsa-malware...

CVE-2026-45364

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.4.17 and 1.5.0-beta.9, Better Auth's HTTP rate limiter keyed each request by the exact textual IP address it received in x-forwarded-for or the configured IP-bearing header. IPv6 clients controlling a typical /6...

@agent-native/core (>=0.26.5 <=0.47.1), @intlayer/backend (=8.7.0-canary.0) +6 more potentially affected by CVE-2026-45337 via better-auth (>=1.6.0 <=1.6.10)

better-auth NPM version =1.6.0, =0.26.5, =0.0.33, =0.2.0, =1.6.0, =0.1.2, =0.2.0 Source cves: CVE-2026-45337 Source advisory: SNYK:JS-BETTERAUTH-17173857...

Improper Authorization

Overview better-auth is a The most comprehensive authentication library for TypeScript. Affected versions of this package are vulnerable to Improper Authorization in the deviceAuthorization plugin. An attacker can gain unauthorized access to a device or deny legitimate user sign-in by submitting ...

@agent-native/core (>=0.26.5 <=0.47.1), @intlayer/backend (=8.7.0-canary.0) +6 more potentially affected by CVE-2026-45337 via better-auth (>=1.6.0 <=1.6.10)

better-auth NPM version =1.6.0, =0.26.5, =0.0.33, =0.2.0, =1.6.0, =0.1.2, =0.2.0 Source cves: CVE-2026-45337 Source advisory: OSV:GHSA-CQ3F-VC6P-68FH...

PT-2026-46307

Am I affected? You are affected if all of the following are true: - You use better-auth at a version = 1.6.0, 1.6.11. - The deviceAuthorization plugin is enabled in your auth config deviceAuthorization in your plugins array. - A third party can observe a pending user code before the legitimate us...

CVE-2026-45364

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.4.17 and 1.5.0-beta.9, Better Auth's HTTP rate limiter keyed each request by the exact textual IP address it received in x-forwarded-for or the configured IP-bearing header. IPv6 clients controlling a typical /6...

CVE-2026-45364 Better Auth: Rate limiter keys IPv6 addresses individually and is bypassable via prefix rotation

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.4.17 and 1.5.0-beta.9, Better Auth's HTTP rate limiter keyed each request by the exact textual IP address it received in x-forwarded-for or the configured IP-bearing header. IPv6 clients controlling a typical /6...

CVE-2026-45364

The CVE-2026-45364 issue affects Better Auth (TypeScript) where the HTTP rate limiter keyed by the leftmost x-forwarded-for value could be bypassed for IPv6. Before fixes, IPv6 prefix rotation (e.g., /64) and multiple textual representations could produce 2^64 distinct keys, letting an attacker p...

CVE-2026-45364 Better Auth: Rate limiter keys IPv6 addresses individually and is bypassable via prefix rotation

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.4.17 and 1.5.0-beta.9, Better Auth's HTTP rate limiter keyed each request by the exact textual IP address it received in x-forwarded-for or the configured IP-bearing header. IPv6 clients controlling a typical /6...

Better Auth 安全漏洞

Better Auth is an open-source TypeScript framework for authentication. Versions of Better Auth prior to 1.4.17 and 1.5.0-beta.9 contained security vulnerabilities. These vulnerabilities stemmed from the HTTP rate limiter, which keyed each request based on the exact text IP address in the...

@altipla/directus-sdk-utils (=0.7.2), @better-auth/sso (>=1.6.0 <=1.7.0-beta.3) +28 more potentially affected by CVE-2026-46490 via samlify (>=2.10.0 <=2.12.0)

samlify NPM version =2.10.0, =1.6.0, =2.10.4, =1.0.0, =11.16.1-depup.0, =27.1.0, =0.73.0, =0.73.0, =0.73.1, =0.73.0, =0.73.1, =0.78.0 and more Source cves: CVE-2026-46490 Source advisory: SNYK:JS-SAMLIFY-16796318...

@better-auth/cli (>=1.5.0-beta.10 <=1.5.0-beta.13), @onmax/nuxt-better-auth (>=0.0.2-alpha.14 <=0.0.2-alpha.32) +2 more potentially affected by CVE-2026-45364 via better-auth (>=1.5.0-beta.10 <=1.5.0-beta.20)

better-auth NPM version =1.5.0-beta.10, =1.5.0-beta.10, =0.0.2-alpha.14, =1.5.0-beta.15, =0.0.2-beta.19, =0.0.10-beta.25 Source cves: CVE-2026-45364 Source advisory: OSV:GHSA-P6V2-XCPG-H6XW...

@alstar/studio (=0.0.0-beta.20), @better-auth/cli (>=0.0.1 <=1.4.1-beta.1) +66 more potentially affected by CVE-2026-45364 via better-auth (>=0.4.10-beta.10 <=1.4.16)

better-auth NPM version =0.4.10-beta.10, =0.0.1, =1.3.27, =1.3.27, =1.3.27, =1.3.27, =1.3.27, =1.3.27, =1.3.26, =1.3.27, =0.18.0, =0.5.2, =1.0.2, =1.0.2, =1.0.2, =1.0.3 and more Source cves: CVE-2026-45364 Source advisory: OSV:GHSA-P6V2-XCPG-H6XW...

Better Auth: Rate limiter keys IPv6 addresses individually and is bypassable via prefix rotation

Am I affected? Users are affected if all of the following are true: - Their app uses better-auth at a version 1.4.17, or at a v1.5 prerelease tagged = 1.5.0-beta.8. - The apps authentication endpoints serve clients reachable over IPv6. Most managed hosts including Cloudflare, Vercel, Fly.io, AWS...

Cross-site Request Forgery (CSRF)

Overview better-auth is a The most comprehensive authentication library for TypeScript. Affected versions of this package are vulnerable to Cross-site Request Forgery CSRF when building an errorURL in parseGenericState, when the storeStateStrategy is set to "cookie" and PKCE is disabled. An...

NPM: Better Auth: OAuth callback accepts mismatched `state` when cookie-backed state storage is used without PKCE

NPM: Better Auth: OAuth callback accepts mismatched state when cookie-backed state storage is used without PKCE vulnerability discovered by ? in WordPress Npm better-auth versions 1.6.2...

Better Auth: OAuth callback accepts mismatched `state` when cookie-backed state storage is used without PKCE

Am I affected? Users are affected if all of the following are true: - The application uses better-auth at a version below 1.6.2 or @better-auth/sso paired with such a version. - betterAuth account: storeStateStrategy is set to "cookie". The default "database" is not affected. - The application...