CVE-2025-27143
Beter Auth has an Open Redirect via Scheme-Less Callback Parameter
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.
INFO
Published Date :
Feb. 24, 2025, 11:15 p.m.
Last Modified :
Feb. 28, 2025, 4:07 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | MEDIUM | [email protected] |
Solution
- Update the Better Auth library to version 1.1.21.
- Validate callback URLs strictly for schemes.
- Test all redirect endpoints thoroughly.
- Review security configurations for redirects.
Public PoC/Exploit Available at Github
CVE-2025-27143 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-27143.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-27143 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-27143
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
A behavioral framework for quantifying user interaction in exploit chains. CATM introduces the Total Threat Interaction Score (TTIS) to prioritize vulnerabilities by how easily users can be tricked or bypassed.
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-27143 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-27143 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Feb. 28, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:better-auth:better_auth:*:*:*:*:*:node.js:*:* versions from (excluding) 1.1.21 Added Reference Type GitHub, Inc.: https://github.com/better-auth/better-auth/commit/24659aefc35a536b95ea4e5347e52c8803910153 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/better-auth/better-auth/commit/b381cac7aafd6aa53ef78b6ab771ebfa24643c80 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/better-auth/better-auth/releases/tag/v1.1.21 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/better-auth/better-auth/security/advisories/GHSA-8jhw-6pjj-8723 Types: Not Applicable Added Reference Type GitHub, Inc.: https://github.com/better-auth/better-auth/security/advisories/GHSA-hjpm-7mrm-26w8 Types: Vendor Advisory -
New CVE Received by [email protected]
Feb. 24, 2025
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-601 Added Reference https://github.com/better-auth/better-auth/commit/24659aefc35a536b95ea4e5347e52c8803910153 Added Reference https://github.com/better-auth/better-auth/commit/b381cac7aafd6aa53ef78b6ab771ebfa24643c80 Added Reference https://github.com/better-auth/better-auth/releases/tag/v1.1.21 Added Reference https://github.com/better-auth/better-auth/security/advisories/GHSA-8jhw-6pjj-8723 Added Reference https://github.com/better-auth/better-auth/security/advisories/GHSA-hjpm-7mrm-26w8