CVE-2026-123803 SuperTokens Core: WebAuthn sign-in accepts a passkey across tenant boundaries
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123803?
CVE-2026-123803 is a high-severity vulnerability in supertokens-core, published on 9 Nov 2026.
Official description
SuperTokens Core is an open source authentication server. From 10.1.0 until 11.0.9, 11.1.4, 11.2.4, 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1, loadOptionsById_Transaction and getUserInfoByCredentialId_Transaction perform application-scoped WebAuthn lookups without constraining them to the requested tenant, and WebAuthN.signIn does not verify tenant membership. In a multi-tenant deployment using WebAuthn with a shared user pool, an ordinary user who possesses their own valid passkey in one tenant can submit its assertion to another tenant's sign-in endpoint in the same application and be authenticated there despite having no membership in the target tenant. This issue is fixed in versions 11.0.9, 11.1.4, 11.2.4, 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1, and 12.3.1.
Which versions are affected by CVE-2026-123803?
How do I fix CVE-2026-123803?
No fix has been published for CVE-2026-123803 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123803 being exploited?
There is no known exploitation of CVE-2026-123803 in the wild and no public exploit code.
Sources
Also known as GHSA-6v34-w48w-44rc.