CVE-2026-107585

Uncontrolled eviction in the pending sign-in tables of the REST API in Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to make other users' OpenID Connect, SAML and passkey sign-ins fail. The routes that start a single sign-on and hand out a passkey sign-in...

CVE-2026-107585

Progressive Robot hMailServer versions 6.3.4 and 6.3.5 are vulnerable to an uncontrolled eviction issue in the REST API pending sign-in tables. Because the routes for single sign-on (OpenID Connect, SAML) and passkey challenges are accessible without authentication, an unauthenticated remote atta...

CVE-2026-107585 Allocation of Resources Without Limits or Throttling in hMailServer

Uncontrolled eviction in the pending sign-in tables of the REST API in Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to make other users' OpenID Connect, SAML and passkey sign-ins fail. The routes that start a single sign-on and hand out a passkey sign-in...