# CVE-2026-107571: Incorrect Default Permissions in hMailServer

> Local attackers can escalate privileges to system level by installing hMailServer in a writable directory, allowing them to replace service binaries.

- **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:** 19 Oct 2026
- **Updated:** 20 Oct 2026
- **Also known as:** GHSA-xgwq-m9m9-pgw3

## What is CVE-2026-107571?

CVE-2026-107571 is a high-severity vulnerability in Progressive Robot Ltd hMailServer, published on 19 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 6.3.6 allow a local authenticated user to run code as the mail server's high-privileged accounts when the product is installed in a folder whose permissions are inherited from a writable parent, such as the root of a drive. The installer places the server's programs in the Bin folder of the program folder and gives neither the program folder nor Bin any permissions of their own, so they inherit the parent's. Under the default location, Program Files, ordinary users receive only read and execute and the configuration is not affected; but the installer accepts any path without warning, and a program folder at the root of an NTFS volume inherits write access for a broad group - Authenticated Users (Modify) on a Windows client, Users (create files and folders) on Windows Server. A local user without administrator rights can then alter or replace the service program, which runs as LocalSystem or as the service's virtual account, or the programs an administrator runs elevated from Bin during setup and maintenance, or place a library in Bin that those programs load in place of the system copy, gaining code execution with those privileges. The default Program Files installation is not affected.

Weakness: CWE-276 (Incorrect Default Permissions)

## Which versions are affected by CVE-2026-107571?


## How do I fix CVE-2026-107571?

No fix has been published for CVE-2026-107571 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-107571 being exploited?

There is no known exploitation of CVE-2026-107571 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-107571 and fix it if it is affected.

What it is: CVE-2026-107571 is a high-severity vulnerability in Progressive Robot Ltd hMailServer, published on 19 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-2026-107571 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-2026-107571/ (Markdown: https://insights.sbomify.com/CVE-2026-107571/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-107571
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-107571
- OSV: https://osv.dev/vulnerability/CVE-2026-107571

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-107571/
Summaries are generated and may contain mistakes; the official description above is the record.