CVE-2026-80192 better-auth SSO before 1.6.27 Domain Ownership Authentication Bypass
Attackers can bypass domain ownership checks in better-auth SSO to add users to their organization or link identities, requiring specific plugin configurations.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-80192?
CVE-2026-80192 is a high-severity authentication bypass vulnerability in better-auth sso, published on 25 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
@better-auth/sso before 1.6.27 (and before 1.4.8 in the 1.4.x line and before 1.7.0-rc.5 in the 1.7 prerelease line) contains two domain-ownership flaws. When domain verification is disabled, automatic organization assignment accepts unverified provider domains, allowing an authenticated organization owner/administrator to register an SSO provider for an arbitrary domain and have users with matching email domains added to the attacker's organization with default member permissions. When domain verification is enabled, a race condition between the verify-domain and update-provider endpoints can apply completed DNS proof to a different domain; combined with implicit account linking, this can link an attacker-controlled identity provider to an existing user account. Exploitation requires the SSO plugin (and, for the org-assignment path, the organization plugin) with the relevant configuration enabled.
Weakness: CWE-287
Which versions are affected by CVE-2026-80192?
How do I fix CVE-2026-80192?
No fix has been published for CVE-2026-80192 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-80192 being exploited?
There is no known exploitation of CVE-2026-80192 in the wild and no public exploit code.
Sources
Also known as GHSA-8c5h-wx78-2cfg, GHSA-xfj7-7fp8-rhvp.