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...

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...

@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.31) +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) +73 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...

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...

9gen (>=0.0.23 <=0.1.1), @1sat/connect (>=0.0.15 <=0.0.58) +720 more potentially affected by unknown CVE via better-auth (>=1.0.0-canary.10 <=1.6.10)

better-auth NPM version =1.0.0-canary.10, =0.0.23, =0.0.15, =0.0.16, =0.0.1, =0.260505.5, =1.0.0, =0.6.1, =0.0.13, =0.3.3, =0.2.0, =0.0.110, =0.0.110, =0.1.41, =0.0.110, =2.0.0-beta.1 and more Source cves: unknown CVE Source advisory: SNYK:JS-BETTERAUTH-16722768...

9gen (>=0.0.23 <=0.1.1), @1sat/connect (>=0.0.15 <=0.0.58) +722 more potentially affected by unknown CVE via better-auth (>=0.4.10-beta.10 <=1.6.10)

better-auth NPM version =0.4.10-beta.10, =0.0.23, =0.0.15, =0.0.16, =0.0.1, =0.260505.5, =1.0.0, =0.6.1, =0.0.13, =0.3.3, =0.2.0, =0.0.110, =0.0.110, =0.1.41, =0.0.110, =2.0.0-beta.1 and more Source cves: unknown CVE Source advisory: OSV:GHSA-WXW3-Q3M9-C3JR...

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...

PT-2026-41393

Name of the Vulnerable Software and Affected Versions Better Auth versions prior to 1.4.17 Better Auth versions prior to 1.5.0-beta.9 Description The HTTP rate limiter in Better Auth identifies requests based on the exact textual IP address found in the x-forwarded-for header or other configured...

@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.31) +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: SNYK:JS-BETTERAUTH-16722787...

Brute Force

Overview better-auth is a The most comprehensive authentication library for TypeScript. Affected versions of this package are vulnerable to Brute Force when rate limiting is enabled which it is by default. The protections of the getIp function, which constructs rate-limiting keys based on the exa...

@alstar/studio (=0.0.0-beta.20), @better-auth/cli (>=1.0.0 <=1.4.1-beta.1) +71 more potentially affected by CVE-2026-45364 via better-auth (>=1.0.0-canary.10 <=1.4.16)

better-auth NPM version =1.0.0-canary.10, =1.0.0, =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: SNYK:JS-BETTERAUTH-16722787...

CVE-2026-41427

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict...

CVE-2026-41427

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.6.5, the clientPrivileges option documents a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. Deployments that configured clientPrivileges to restrict...

CVE-2026-41427

CVE-2026-41427 affects Better Auth (TypeScript) OAuth provider. Prior to version 1.6.5, the clientPrivileges option documented a create action, but the OAuth client creation endpoints did not invoke the hook before persisting new clients. As a result, deployments configured to restrict client reg...