Progressive Robot hMailServer 6.3.7 Windows installer permission

Summaryinfo

A vulnerability classified as critical was found in Progressive Robot hMailServer 6.3.7. Affected by this issue is some unknown functionality of the component Windows installer. Such manipulation leads to permission. This vulnerability is uniquely identified as CVE-2026-126624. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability was found in Progressive Robot hMailServer 6.3.7 and classified as critical. Affected by this issue is an unknown function of the component Windows installer. The manipulation with an unknown input leads to a permission vulnerability. Using CWE to declare the problem leads to CWE-275. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Unverified ownership in the Windows installer of Progressive Robot hMailServer 6.3.7 allows a local authenticated user to run code as the mail server's service account or as an administrator when setup installs into, or upgrades, a program folder that accounts other than the administrators could write before, such as one made beforehand at the root of a drive. 6.3.7 fixed CVE-2026-107571 by giving the program folder, Bin and ControlPanel permissions that only administrators may change, but setup refused nothing that was already in them, or in the folders that hold the event script, the add-ons and the database scripts: a program, a library, a script or a settings file that another account owns, or whose own permissions let another account change it, is kept with that owner and those permissions, which the hardening of the folders does not take away. Setup then runs programs from Bin with the administrator's elevated rights, and the service, which runs as LocalSystem or as its virtual account, runs them and the event script, so that a library such an account placed in Bin is loaded in place of the system's; the account can still change the file after the installation. The default installation under Program Files is not affected.

The advisory is available at gitlab.com. This vulnerability is handled as CVE-2026-126624 since 11/11/2026. The exploitation is known to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1222 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Mail Server Software

Vendor

• Progressive Robot

Name

• hMailServer

Version

• 6.3.7

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

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CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

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Timelineinfo

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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