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VulnerabilityPublished

CVE-2026-126607: Progressive Robot hMailServer · Uncontrolled Search Path Element

Affects Progressive Robot hMailServerSource CVE Database V5

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Not known to be exploited · CVSS 7.8 High · fixed in 6.3.8 : patch Progressive Robot hMailServer soon.

Data as of 11 Nov 2026, 08:50 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
Patch
Available – fixed in 6.3.8
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–

AI-suggested

Upgrade to hMailServer version 6.3.8 or later, which fixes the vulnerability by correctly handling plugin folder paths and restricting plugin loading to secure locations. No other mitigation is recommended as the fix addresses the root cause. The vulnerability does not affect default installations under Program Files or Linux builds.

Description

CVE-2026-126607 is an uncontrolled search path element vulnerability in Progressive Robot Ltd's hMailServer versions 6.2.3 through 6.3.7 on Windows when using MySQL or MariaDB databases. The issue arises from how the MariaDB Connector/C client interprets the plugin folder path using system ANSI code pages, allowing a local authenticated user to execute code with the hMailServer service's privileges by placing a malicious DLL in a crafted folder path. Version 6.3.8 addresses this by properly handling folder paths and restricting plugin loading to secure locations. Linux builds are not affected.

References

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