Better Auth allows bypassing the trustedOrigins Protection which leads to ATO
Priority LOW 38CWE-601Published · Updated
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- —
- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub. Impact type from CWE-601.
Summary
### Summary A bypass was discovered in the trustedOrigins validation logic—affecting both absolute URL entries and wildcard domain patterns. This flaw allows an attacker to construct a malicious callbackURL that passes origin checks and triggers an open redirect. Because redirect endpoints include sensitive tokens (such as password-reset tokens), this vulnerability can enable one-click account takeover if a victim clicks a crafted link.
Why it matters now
Fix Fixed better-auth (npm): 1.1.21
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | better-auth (npm) | before 1.1.21 | 1.1.21 | Patch available | GHSA-vp58-j275-797x |
- better-auth (npm) Vendor— Affected before 1.1.21 Fixed in 1.1.21 Patch available GHSA-vp58-j275-797x
Remediation
- Fix · GHSA-vp58-j275-797x better-auth (npm) Fixed in 1.1.21 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-vp58-j275-797x
References
Other 4
- https://github.com/better-auth/better-auth/security/advisories/GHSA-vp58-j275-797x
- https://github.com/better-auth/better-auth/commit/b381cac7aafd6aa53ef78b6ab771ebfa24643c80
- https://github.com/better-auth/better-auth
- https://github.com/better-auth/better-auth/blob/ddebd0358d74376ea64541512d0167dd4377f182/packages/better-auth/src/api/middlewares/origin-check.ts#L53
Sources
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