Vulnerability · Published Aug 1, 2026 · Assigned by VulnCheck
CVE-2025-71403better-auth before 1.1.20 Open Redirect via trustedOrigins Bypass
High 7.1
In plain English
A high-severity open redirect in better-auth from better-auth. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.1High
Exploit odds (30 days)0.3%top 72.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | better-auth | 1.1.21 | GHSA-vp58-j275-797x |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| better-auth | better-auth | 0 – before 1.1.20 |
Weakness: CWE-601 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
References
- GitHub Security Advisory (GHSA-vp58-j275-797x) vendor-advisory
- VulnCheck Advisory: better-auth before 1.1.20 Open Redirect via trustedOrigins Bypass third-party-advisory