User redirection via trusted-origin prefix confusion
Published Jul 7, 2025 · Updated Jul 7, 2025
Open redirect in Better Auth before 1.2.10 allows remote attackers to redirect users through crafted authentication callback URLs. The originCheck middleware's matchesPattern function accepts any URL whose string prefix matches a trusted origin, without validating the parsed origin boundary. Exploitation requires a user to follow a crafted link through one of five affected authentication routes; the resulting redirect can send the browser to an untrusted site.
Summary
What happened
Open redirect in Better Auth before 1.2.10 allows remote attackers to redirect users through crafted authentication callback URLs. The originCheck middleware's matchesPattern function accepts any URL whose string prefix matches a trusted origin, without validating the parsed origin boundary. Exploitation requires a user to follow a crafted link through one of five affected authentication routes; the resulting redirect can send the browser to an untrusted site.
The record
- CVE
- CVE-2025-53535
- Published
- Jul 7, 2025
- Updated
- Jul 7, 2025
- Vendor
- Better Auth
- Product
- Better Auth
- Classifications
- CWE-601, CAPEC-178, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 7, 2025CVE publishedPublication date reported by the CVE source.
- Jul 7, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.2.10
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream open-redirect proof-of-concept requestsproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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