CVE-2026-114476 Progressive Robot hMailServer - Broken Access Control

Progressive Robot hMailServer 6.3.4 through 6.3.6 contains an authorization bypass caused by improper role assignment checks in the REST administration API, letting remote authenticated users with manage_roles permission escalate to server administrator authority, exploit requires valid credentials with manage_roles permission.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
21 October 2026
Updated
22 October 2026
Weakness
CWE-863

Vendor fix

Update to a version later than 6.3.6 or the latest available version.

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

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