Vulnerability in Better-auth

CVE-2026-45364

Better Auth is an authentication and authorization library for TypeScript. Prior to 1.4.17 and 1.5.0-beta.9, Better Auth's HTTP rate limiter keyed each request by the exact textual IP address it received in x-forwarded-for (or the configur…

EPSS: 0.001 (24.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

  • Better-auth — versions < 1.4.17, >= 1.5.0-beta.1, < 1.5.0-beta.9

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-45364?
CVE-2026-45364 is a high-severity vulnerability in Better-auth, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 7.3/10. Published 2026-05-28.
How severe is CVE-2026-45364?
High severity. CVSS v3 base score is 7.3 out of 10.