What is CVE-2026-39454?

CVE-2026-39454 is a high-severity vulnerability in Sky Co.,ltd. Skymec It Manager, classified under Incorrect Default Permissions. CVSS score: 7.8/10. Published 2026-04-20.

How severe is CVE-2026-39454?

High severity. CVSS v3 base score is 7.8 out of 10.

Auth bypass in Sky Co.,ltd. Skymec It Manager

CVE-2026-39454

SKYSEA Client View and SKYMEC IT Manager provided by Sky Co.,LTD. configure the installation folder with improper file access permission settings. A non-administrative user may manipulate and/or place arbitrary files within the installation folder of the product. As a result, arbitrary code may be executed with the administrative privilege.

Published 2026-04-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (3.7th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 4th percentile — 3.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000

Affected products

Sky Co.,ltd. Skymec It Manager — versions Ver.2024.005.10a and earlier
Sky Co.,ltd. Skysea Client View — versions Ver.21.200.07j and earlier
Skygroup Skymec It Manager
Skygroup Skysea Client View

Weakness classification (CWE)

References

www.skyseaclientview.net/news/260420_01/ (Vendor Advisory)
jvn.jp/en/jp/JVN63376363/ (Third Party Advisory)

Frequently asked questions

What is CVE-2026-39454?: CVE-2026-39454 is a high-severity vulnerability in Sky Co.,ltd. Skymec It Manager, classified under Incorrect Default Permissions. CVSS score: 7.8/10. Published 2026-04-20.
How severe is CVE-2026-39454?: High severity. CVSS v3 base score is 7.8 out of 10.