CVE-2026-107571
Incorrect Default Permissions in hMailServer
02 Description
Incorrect Default Permissions in hMailServer
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.10% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 0.8% of scored records. A rank, not a probability.
- NVD base score
- 7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Deferred. NVD last modified this record on 2026-10-20.
- Red Hat severity
- No Red Hat rating. Red Hat rates the CVEs that affect its products.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2026-10-19 15:34Z9 DAYS AGO
- Last updated
- 2026-10-20 19:27Z8 DAYS AGO
- Reserved
- 2026-10-08
- Assigning CNA
- GitLab
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.8)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-276Incorrect Default PermissionsBase
- Data version
- 5.2
- Document digest
- 698011769ef9a65322f2e98de2ffaa0b5a93739d8b5fbf3e70b7abf67fd38ab4
05 Affected products
06 References
07 Remediation
Upgrade to hMailServer 6.3.7. Its hMailServer.exe /ProtectFolders, which setup runs at the end of every server installation and upgrade, gives the program folder, Bin and ControlPanel SYSTEM and the Administrators full control and Users read and execute (where every user could read the folder), nothing inherited, and, where another account owned one of them, makes the Administrators its owner and takes away that folder's own entries that let others change it; setup also gives a program folder it creates those permissions before it copies anything into it, and hardens, before its files, the existing folder of an installation of the Control Panel alone. 6.3.7 does not yet create a new program folder with those permissions already in place, harden the folder before setup's own steps on an upgrade, a repair or a server installation into a folder that already existed, refuse a link or junction on the program folder's path (it is logged), or list the files in Bin and ControlPanel by owner. Before upgrading an affected installation, or until it is upgraded, follow from an elevated Command Prompt the steps in the hMailServer documentation, ServiceAccount.md, "Before upgrading an installation at a drive's root": first note who owns the program folder and what is directly in it (dir /q /a "<folder>") and everything in Bin, ControlPanel, Events, WebAdmin, DBScripts, Addons and Languages (dir /q /s /a); then, for the program folder, then Bin, then ControlPanel, make the Administrators