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01 Record

CVE-2026-107578

Improper Link Resolution Before File Access ('Link Following') in hMailServer

MediumPUBLISHEDCNA: GitLab
CNA base score6.7 CVSS v3.xCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H

02 Description

Improper Link Resolution Before File Access ('Link Following') 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.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.07% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 0.0% of scored records. A rank, not a probability.
NVD base score
6.7 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
NVD analysis status
Deferred. NVD last modified this record on 2026-10-08.
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
2026-10-08 11:47Z21 DAYS AGO
Last updated
2026-10-08 14:17Z21 DAYS AGO
Reserved
2026-10-08
Assigning CNA
GitLab
Record state
PUBLISHED
Severity
Medium (CVSS 6.7)
CNA CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-59Improper Link Resolution Before File Access ('Link Following')Base
Data version
5.2
Document digest
2411b41e0110e91ddc1d31f02fcc70707da9f6eb33da41db5005bde16fe942d7

05 Affected products

VendorProductVersionsPlatforms
Progressive Robot LtdhMailServer6.3.4 to < 6.3.6—

06 References

07 Remediation

Upgrade to hMailServer 6.3.6, in which every administrative command writes nothing to the logs and arms no crash recorder, writes the certificate only through folders held open and checked from the drive's root, reaches no file a database row names outside the data folder, and walks the data folder before any store command - going through a junction or mount point only when the administrators alone own and control it and refusing any other; and on Linux a store or object-storage command run as root first drops to the service account, so it follows no link that account planted. Until then: on Windows run the service as LocalSystem, or stop the service and check the program folder's Logs, Data, Temp and Database folders for junctions, mount points and symbolic links and that no message row names a path outside the data folder; on Linux run the store commands only as the service user, never as root.