CVE - CVE-2025-27143

CVE-ID
CVE-2025-27143	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
Better Auth is an authentication and authorization library for TypeScript. Prior to version 1.1.21, the application is vulnerable to an open redirect due to improper validation of the callbackURL parameter in the email verification endpoint and any other endpoint that accepts callback url. While the server blocks fully qualified URLs, it incorrectly allows scheme-less URLs. This results in the browser interpreting the URL as a fully qualified URL, leading to unintended redirection. An attacker can exploit this flaw by crafting a malicious verification link and tricking users into clicking it. Upon successful email verification, the user will be automatically redirected to the attacker's website, which can be used for phishing, malware distribution, or stealing sensitive authentication tokens. This CVE is a bypass of the fix for GHSA-8jhw-6pjj-8723/CVE-2024-56734. Version 1.1.21 contains an updated patch.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://github.com/better-auth/better-auth/commit/24659aefc35a536b95ea4e5347e52c8803910153 URL:https://github.com/better-auth/better-auth/commit/24659aefc35a536b95ea4e5347e52c8803910153 MISC:https://github.com/better-auth/better-auth/commit/b381cac7aafd6aa53ef78b6ab771ebfa24643c80 URL:https://github.com/better-auth/better-auth/commit/b381cac7aafd6aa53ef78b6ab771ebfa24643c80 MISC:https://github.com/better-auth/better-auth/releases/tag/v1.1.21 URL:https://github.com/better-auth/better-auth/releases/tag/v1.1.21 MISC:https://github.com/better-auth/better-auth/security/advisories/GHSA-8jhw-6pjj-8723 URL:https://github.com/better-auth/better-auth/security/advisories/GHSA-8jhw-6pjj-8723 MISC:https://github.com/better-auth/better-auth/security/advisories/GHSA-hjpm-7mrm-26w8 URL:https://github.com/better-auth/better-auth/security/advisories/GHSA-hjpm-7mrm-26w8
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20250219	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20250219)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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