CVE-2026-66305
Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.
CVSS
7.1
High
EPSS
—
KEV
—
Exploit Today
—
0-100
Published: Sep 8, 2026 · Last modified: Sep 8, 2026 · CWE-603
Not enough EPSS history yet.
Use of client-side authentication in Skype for Business allows an authorized attacker to perform spoofing over a network.
CVECVSSEPSSKEVRExploitTitleMod.
CVE-2026-769457.5 HIG29.5%
——9The affected Ebyte device relies on client-managed authentication tokens
without sufficient server-side validation. An attacker may replay or
manipulate authentication tokens to gain unauthorized access to
administrative functionality.8dCVE-2026-711879.8 CRI42.4%
——13The Ebyte device relies on client side authentication logic that can be
reproduced by unauthenticated users. An attacker may generate valid
authentication requests and bypass authentication to obtain
administrative access to the device.8dCVE-2026-88304.3 MED32.4%
——10A flaw was found in Keycloak. An authenticated user can bypass configured WebAuthn policies during credential registration by manipulating client-side JavaScript. This occurs because the server-side processAction() fails to validate that the newly created credential's parameters, such as public key algorithms, match the realm's configured WebAuthn policies. This could lead to the creation of credentials that do not adhere to administrative security requirements, potentially weakening the overall security posture of the system by allowing non-compliant authentication methods.47d