---
title: "CVE-2026-107571: Progressive Robot hMailServer - Privilege Escalation"
description: "Progressive Robot hMailServer 6.0.0 through 6.3.6 contains a privilege escalation caused by incorrect default permissions in the installer folder inheritance, letting local authenticated users execute code as high-privileged mail server accounts, exploit requires installation in a writable parent folder."
url: https://panop.io/threat-heartbeat/CVE-2026-107571/
---

# CVE-2026-107571 Progressive Robot hMailServer - Privilege Escalation

Progressive Robot hMailServer 6.0.0 through 6.3.6 contains a privilege escalation caused by incorrect default permissions in the installer folder inheritance, letting local authenticated users execute code as high-privileged mail server accounts, exploit requires installation in a writable parent folder.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-107571)

## Details

Type

Privilege Escalation

Impact

Remote Code Execution, Privilege Escalation

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Published

19 October 2026

Updated

20 October 2026

Weakness

[CWE-276](https://cwe.mitre.org/data/definitions/276.html)

## Vendor fix

Update to a version later than 6.3.6 or ensure installation in default Program Files directory with correct permissions.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-107571](https://nvd.nist.gov/vuln/detail/CVE-2026-107571)
- [https://gitlab.com/hmailserver/hmailserver/-/work\_items/78](https://gitlab.com/hmailserver/hmailserver/-/work_items/78)
- [https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.7](https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.7)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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