Better Auth
CVE-2024-56734
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V3 - Web Frontend Security Redirect URL validation
MITRE ATT&CK
1 technique across 1 tactic: Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 7.9 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | A remote attacker could redirect users to malicious websites via URL manipulation by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
Better Auth is an authentication library for TypeScript. Rated high severity (CVSS 7.9), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Validate redirect destinations against an allowlist, avoid using user input in redirect URLs.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in npm
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Open Redirect (CWE-601), which allows attackers to redirect users to malicious websites via URL manipulation. Better Auth is an authentication library for TypeScript. An open redirect vulnerability has been identified in the verify email endpoint of all versions of Better Auth prior to v1.1.6, potentially allowing attackers to redirect users to malicious websites. The verify email callback endpoint accepts a callbackURL parameter. Unlike other verification methods, email verification only uses JWT to verify and redirect without proper validation of the target domain. The origin checker is bypassed in this scenario because it only checks for POST requests. An attacker can manipulate this parameter to redirect users to arbitrary URLs controlled by the attacker. Version 1.1.6 contains a patch for the issue. Affected products include: Better-Auth Better Auth. Version information: Version 1.1.6.
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Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
Primary rating from Vendor (github) · only source for this CVE.
CVSS VectorVendor: github
DescriptionCVE.org
Better Auth is an authentication library for TypeScript. An open redirect vulnerability has been identified in the verify email endpoint of all versions of Better Auth prior to v1.1.6, potentially allowing attackers to redirect users to malicious websites. This issue affects users relying on email verification links generated by the library. The verify email callback endpoint accepts a callbackURL parameter. Unlike other verification methods, email verification only uses JWT to verify and redirect without proper validation of the target domain. The origin checker is bypassed in this scenario because it only checks for POST requests. An attacker can manipulate this parameter to redirect users to arbitrary URLs controlled by the attacker. Version 1.1.6 contains a patch for the issue.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
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What every action level means
SSVC AssessmentENISA
Priority Score
Affected Products (CPE)CVE.org
More in Better Auth
View allAuthorization bypass in the @better-auth/oauth-provider plugin for Better Auth (versions >= 1.4.8-beta.7 and < 1.6.5, pl
Privilege-escalating account takeover in the @better-auth/scim plugin (versions 1.4.0-beta.27 through 1.6.21 and 1.7.0-b
Authentication bypass in Better Auth before 1.6.11 stems from insecure cryptographic defaults in the legacy oidcProvider
Denial of service in Better Auth (npm) before 1.4.2 lets an unauthenticated remote attacker poison the router's base pat
Unauthenticated OAuth state values can be redeemed as Magic Link tokens in Better Auth 1.4.0-beta.18 through 1.7.6, lett
Authentication bypass in Better Auth's OAuth Proxy plugin (versions 1.5.0-beta.12 through 1.7.6) lets unauthenticated re
Path normalization bypass in Better Auth before v1.4.5 allows unauthenticated remote attackers to circumvent `disabledPa
Authorization bypass in @better-auth/scim versions 1.5.0 through 1.7.0-beta.3 allows any authenticated user to fully tak
Pre-account hijacking in better-auth (npm) allows a remote attacker to gain persistent, password-based access to any vic
Multiple authentication bypass vulnerabilities in @better-auth/sso before version 1.6.21 enable low-privileged attackers
Two domain-ownership authentication bypass flaws in @better-auth/sso allow authenticated organization owners to compromi
Better Auth versions 1.3.8-beta.3 to before 1.7.0-rc.3 with the deviceAuthorization plugin enabled are vulnerable to a U
Exploit-DB