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CVE-2025-71403

better-auth before 1.1.20 Open Redirect via trustedOrigins Bypass

Published: Aug 1, 2026Updated: Aug 3, 2026 Sources: CVE List NVDCWE-601
7.1HIGH
NVD MITRE
EPSS Score
0.2%
Top 85.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

better-auth versions before 1.1.20 contain a bypass vulnerability in trustedOrigins validation logic affecting absolute URLs and wildcard domains. Attackers can construct malicious callbackURL parameters that pass origin checks and trigger open redirects to steal sensitive tokens for account takeover.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:RS:UC:LI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-601

Affected Products

better-auth
oss-projectaka better auth
better-authLibrary
OSS Libraries / web-framework

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Initial Access
View detailed technique mapping

References

https://github.com/better-auth/better-auth/security/advisories/GHSA-vp58-j275-797x
github.com
https://www.vulncheck.com/advisories/better-auth-before-open-redirect-via-trustedorigins-bypass
vulncheck.com

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