Medium 6.5Published Aug 1, 2026

CVE-2026-67337better-auth before 1.4.9 Two-Factor Authentication Bypass via session.cookieCache

Updated under an hour ago (Oct 25, 2026, 9:50 PM ET)

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It affects better-auth. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-288
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Aug 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

better-auth better-auth better_auth:better_auth (from the name)	before 1.4.9; 1.4.9 not affected	CNA record

References

https://github.com/better-auth/better-auth/security/advisories/GHSA-xg6x-h9c9-2m83vendor-advisory
https://www.vulncheck.com/advisories/better-auth-before-two-factor-authentication-bypass-via-session-cookiecachethird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.