CVE-2026-107585
Description
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 challenge are reached without authentication and stored pending state in bounded tables that dropped their oldest entry when full, whoever had started it. An attacker who starts sign-ins a few times a second (about a hundred a second for passkeys) pushes every other user's pending sign-in out of the table before that user's browser returns, denying single sign-on and passkey sign-in for as long as the requests continue.
How to fix
- Progressive Robot Ltd hMailServer6.3.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Progressive Robot Ltd hMailServer | 6.3.4 ≤ v < 6.3.6 | 6.3.6 |
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