CVE-2026-110863 Better Auth - Authentication Bypass

Better Auth @better-auth/sso >= 1.7.0-rc.2 < 1.7.3 contains an authentication bypass caused by ignoring providerId in account lookup when registering personal SSO providers, letting authenticated users sign in as other users.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-287

Vendor fix

Upgrade to version 1.7.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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