Medium
Beter Auth has an Open Redirect via Scheme-Less Callback Parameter
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-27143
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 04:01 UTC · Revision 1
Source evidence
Beter Auth has an Open Redirect via Scheme-Less Callback Parameter
core-osv · Original sourcePublished 24 Feb 2025, 22:16 UTC
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.
osv:CVE-2025-27143
Complete source record
{
"id": "a11d2cdb83ce6c2af2fe5e075dee3a15a89079517a9f7bcb4d6b41c457e14b39",
"url": "https://osv.dev/vulnerability/CVE-2025-27143",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Beter Auth has an Open Redirect via Scheme-Less Callback Parameter",
"summary": "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.",
"evidence": "osv:CVE-2025-27143",
"products": [],
"severity": "medium",
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"aliases": [
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"metrics": [
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"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"
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"modified": "2026-10-28T02:30:25.669452214Z",
"provider": "osv",
"references": [
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"https://github.com/better-auth/better-auth/security/advisories/GHSA-hjpm-7mrm-26w8",
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},
"source_id": "core-osv",
"document_id": 492349,
"published_at": "2025-02-24T22:16:55.224+00:00"
}