# CVE-2026-114489: Progressive Robot hMailServer missing authorization in REST and COM administration APIs

Source: https://junglewise.ai/threats/cve-2026-114489-missing-authorization-in-the-rest-and-com-administration-apis-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-21. Updated: 2026-10-21  
License: CC BY 4.0 with a link back

CVE-2026-114489 · Severity: high · CVSS 8.1 · Published 2026-10-21

hMailServer is a mail server used to host email for multiple organizations on a single server. Attackers with limited administrative credentials for specific domains can bypass authorization checks to modify mail routing and domain settings across other organizations' domains, allowing them to intercept, redirect, or block other tenants' email traffic and access restricted credentials.

Technologies: [Progressive Robot hMailServer](https://junglewise.ai/threats/technologies/hmailserver). Vendors: [Progressive Robot](https://junglewise.ai/threats/vendors/progressive-robot).

## Quick answers

**Is CVE-2026-114489 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-114489 being exploited in the wild.

**How severe is CVE-2026-114489?** High severity, with a CVSS score of 8.1, published 21 October 2026.

**Which products and versions are affected?** Progressive Robot hMailServer 6.0.0 through 6.3.6.

**Is there a fix for CVE-2026-114489?** Yes: fixed in 6.3.7. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-114489 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-114489?** Check whether you run Progressive Robot hMailServer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 6.3.7

## Technical details

Missing authorization in REST and COM administration API handlers allows authenticated users with confined domain credentials to access configuration beyond their authorized scope. A domain administrator, account, or API key scoped to named domains can create unauthorized domain aliases, rename domains, modify rule actions (bind-address, send-using-route, script-function), and set relay hosts without proper privilege checks. The vulnerability exists because authorization gates did not validate scope against confined credentials, and handlers were not provided caller context for permission enforcement.

## Affected products

- Progressive Robot hMailServer 6.0.0 through 6.3.6

## Timeline

- 2026-10-21: disclosed
- 2026-10-21: patched: Fixed in version 6.3.7

## References

- [https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.7](https://gitlab.com/hmailserver/hmailserver/-/releases/v6.3.7)
- [https://gitlab.com/hmailserver/hmailserver/-/work_items/86](https://gitlab.com/hmailserver/hmailserver/-/work_items/86)

## Related threats

- [Progressive Robot hMailServer denial of service in web services listener](https://junglewise.ai/threats/cve-2026-126626-the-web-services-listener-of-progressive-robot-hmailserver-6-3-3)
- [hMailServer Windows installer privilege escalation via insecure folder permissions](https://junglewise.ai/threats/cve-2026-126625-incorrect-default-permissions-in-the-windows-installer-of)
- [hMailServer Windows installer privilege escalation in Bin folder](https://junglewise.ai/threats/cve-2026-126624-unverified-ownership-in-the-windows-installer-of-progressive)
- [Progressive Robot hMailServer inefficient JSON parsing DoS](https://junglewise.ai/threats/cve-2026-126623-inefficient-algorithmic-complexity-in-the-json-reader-of)
- [Progressive Robot hMailServer incorrect default installer permissions](https://junglewise.ai/threats/cve-2026-126622-incorrect-default-permissions-in-the-windows-installer-of)