CVE-2026-104660 Progressive Robot hMailServer - Broken Access Control

Progressive Robot hMailServer 6.0.0 through 6.3.5 on Windows contains a broken access control vulnerability caused by missing authorization on COM objects, letting local users read/write arbitrary files and send mail as any sender without credentials, exploit requires local interactive access.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.11% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
File System Read, File System Write, Broken Access Control
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
8 October 2026
Updated
15 October 2026
Weakness
CWE-862

Vendor fix

Update to a version later than 6.3.5 or apply vendor patches addressing COM object authorization.

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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