CVE-2026-107573 Incorrect Default Permissions in hMailServer
Local attackers can read sensitive mail data and configuration files due to insecure default folder permissions in the hMailServer installer.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-107573?
CVE-2026-107573 is a high-severity vulnerability in Progressive Robot Ltd hMailServer, published on 8 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Incorrect default permissions in the Windows installer of Progressive Robot hMailServer 6.0.0 through 6.3.5 allow a local authenticated user to read the mail server's data. The installer created the data, log, temp, database and event folders and the hMailServer.INI configuration file with the permissions inherited from the installation folder, by default under Program Files, which give the local Users group read access. Any user who can sign in to the computer could read every stored message, the logs, the built-in database with the accounts' password hashes whenever the service is stopped, and the configuration file, including the database password, which is sealed only with the machine's DPAPI key and can be unsealed by any local account; with an external database that password gives full control of it. The Linux AppImage of 6.3.0 through 6.3.5 likewise created its per-user data folders readable by other local users.
Weakness: CWE-276
Which versions are affected by CVE-2026-107573?
How do I fix CVE-2026-107573?
No fix has been published for CVE-2026-107573 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-107573 being exploited?
There is no known exploitation of CVE-2026-107573 in the wild and no public exploit code.
Sources
Also known as GHSA-6v8h-9479-g4ch.