# 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.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Oct 2026
- **Updated:** 8 Oct 2026
- **Also known as:** GHSA-6v8h-9479-g4ch

## 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 (Incorrect Default Permissions)

## 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.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-107573 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-107573 in the wild and no public exploit code.

Affected product: Progressive Robot Ltd hMailServer. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-107573/ (Markdown: https://insights.sbomify.com/CVE-2026-107573/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-107573
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107573
- OSV: https://osv.dev/vulnerability/CVE-2026-107573

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-107573/
Summaries are generated and may contain mistakes; the official description above is the record.