CVE-2026-67337

better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache

State: Published
Severity: 7.1 High
Published: Aug 1, 2026
Updated: Aug 3, 2026
Reserved: Jul 29, 2026

Description

better-auth versions before 1.4.9 contain a two-factor authentication bypass vulnerability when session.cookieCache is enabled. Attackers with valid primary credentials can access authenticated routes without completing second-factor verification by exploiting premature session caching.

Scores

CVSS	Score	Vector	Source
4.0	7.1 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N	VulnCheck
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N	VulnCheck

Weaknesses

CWE-288 Authentication Bypass Using an Alternate Path or Channel

Affected Products

Product	Versions
better-authbetter-auth	before 1.4.9Affected 1.4.9Not affected

References

GitHub Security Advisory (GHSA-xg6x-h9c9-2m83)vendor-advisory
VulnCheck Advisory: better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCachethird-party-advisory

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