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CVE-2026-126607VulnerabilityPublished

Progressive Robot hMailServer 6.2.3 through 6.3.7 on Windows, with a MySQL or MariaDB database, hands the bundled

Source GCVE Database

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Authoritative record:CVE-2026-126607· High 7.8

Not known to be exploited · CVSS 7.8 High.

Data as of 11 Nov 2026, 10:05 UTC

CVSS 3.1 base score
7.8High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitLab)CVSS 3.17.8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Progressive Robot LtdhMailServerAffected
  • >=6.2.3 <=6.3.7
Fixed in–
GitHubhmailserver/hmailserverpkg:github/hmailserver/hmailserverOther threatsAffected
  • >=6.2.3 <=6.3.7
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade to hMailServer version 6.3.8 or later, which fixes the vulnerability by properly handling plugin folder paths and restricting plugin loading to secure locations. If upgrading is not immediately possible, ensure the installation path uses only ASCII characters and restrict local authenticated users from creating folders in locations where the service might load plugins. Avoid running the service with elevated privileges unnecessarily. The vendor advisory indicates that 6.3.8 fully addresses the issue.

Description

Progressive Robot hMailServer versions 6.2.3 through 6.3.7 on Windows, when configured with a MySQL or MariaDB database, improperly handle the path to authentication plugins. This flaw allows a local authenticated user to execute code with the hMailServer service's privileges by exploiting how the plugin folder path is converted and loaded, especially when the installation path contains certain non-ASCII characters. Version 6.3.8 addresses these issues by properly handling plugin folder paths and restricting plugin loading to secure locations. Linux builds and default installations under ASCII-only paths are not affected.

References

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