SuperTokens Core up to 12.3.0 WebAuthn access control

Summaryinfo

A vulnerability, which was classified as critical, has been found in SuperTokens Core up to 12.3.0. The impacted element is the function loadOptionsById_Transaction/getUserInfoByCredentialId_Transaction/WebAuthN.signIn of the component WebAuthn. This manipulation causes access control. This vulnerability is handled as CVE-2026-123803. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in SuperTokens Core up to 12.3.0. It has been declared as critical. Affected by this vulnerability is the function loadOptionsById_Transaction/getUserInfoByCredentialId_Transaction/WebAuthN.signIn of the component WebAuthn. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-123803 since 11/06/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

Upgrading to version 11.0.9, 11.1.4, 11.2.4, 11.3.8, 11.4.8, 12.0.11, 12.1.2, 12.2.1 or 12.3.1 eliminates this vulnerability.

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Productinfo

Vendor

• SuperTokens

Name

• Core

Version

• 10.x
• 11.0.0
• 11.0.1
• 11.0.2
• 11.0.3
• 11.0.4
• 11.0.5
• 11.0.6
• 11.0.7
• 11.0.8
• 11.1.0
• 11.1.1
• 11.1.2
• 11.1.3
• 11.2.0
• 11.2.1
• 11.2.2
• 11.2.3
• 11.3.0
• 11.3.1
• 11.3.2
• 11.3.3
• 11.3.4
• 11.3.5
• 11.3.6
• 11.3.7
• 11.4.0
• 11.4.1
• 11.4.2
• 11.4.3
• 11.4.4
• 11.4.5
• 11.4.6
• 11.4.7
• 12.0
• 12.0.0
• 12.0.1
• 12.0.2
• 12.0.3
• 12.0.4
• 12.0.5
• 12.0.6
• 12.0.7
• 12.0.8
• 12.0.9
• 12.0.10
• 12.1
• 12.1.0
• 12.1.1
• 12.2
• 12.2.0
• 12.3.0

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