Vulnerability-Lookup

CVE-2026-39454 (GCVE-0-2026-39454)

Vulnerability from cvelistv5 – Published: 2026-04-20 08:04 – Updated: 2026-04-20 13:28

Summary

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.

Severity

7.8 (High)


                        
                          CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

8.5 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-20 13:28 UTC

CWE

CWE-276 - Incorrect default permissions

Assigner

jpcert CNA under the jpcert root

CNA scorecard C 64/100 over 176 records in the last 180 days details

References

2 references

URL	Tags
https://www.skyseaclientview.net/news/260420_01/
https://jvn.jp/en/jp/JVN63376363/

Impacted products

2 products

Vendor	Product	Version	CPE status
Sky Co.,LTD.	SKYSEA Client View	Affected: Ver.21.200.07j and earlier	guessed
Sky Co.,LTD.	SKYMEC IT Manager	Affected: Ver.2024.005.10a and earlier	guessed

Show details on NVD website

JSON

To clipboard

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                "timestamp": "2026-04-20T13:28:48.426227Z",
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          }
        ],
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}

FKIE_CVE-2026-39454

Vulnerability from fkie_nvd - Published: 2026-04-20 09:16 - Updated: 2026-06-17 10:42

Severity

7.8 (High) - CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	vultures@jpcert.or.jp	https://jvn.jp/en/jp/JVN63376363/	Third Party Advisory
	vultures@jpcert.or.jp	https://www.skyseaclientview.net/news/260420_01/	Vendor Advisory

Impacted products

	Vendor	Product	Version
	skygroup	skymec_it_manager	*
	skygroup	skysea_client_view	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "SKYSEA Client View",
          "vendor": "Sky Co.,LTD.",
          "versions": [
            {
              "status": "affected",
              "version": "Ver.21.200.07j and earlier"
            }
          ]
        },
        {
          "product": "SKYMEC IT Manager",
          "vendor": "Sky Co.,LTD.",
          "versions": [
            {
              "status": "affected",
              "version": "Ver.2024.005.10a and earlier"
            }
          ]
        }
      ],
      "source": "vultures@jpcert.or.jp"
    }
  ],
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              "versionEndIncluding": "2024.005.10a",
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    }
  ],
  "id": "CVE-2026-39454",
  "lastModified": "2026-06-17T10:42:07.470",
  "metrics": {
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          "exploitMaturity": "NOT_DEFINED",
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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    ],
    "ssvcV203": [
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        }
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}

GHSA-3224-28WC-WHRH

Vulnerability from github – Published: 2026-04-20 09:30 – Updated: 2026-04-20 09:30

Details

Severity

7.8 (High)


                  
                    CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

8.5 (High)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-39454"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-276",
      "CWE-863"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-20T09:16:08Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-3224-28wc-whrh",
  "modified": "2026-04-20T09:30:45Z",
  "published": "2026-04-20T09:30:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-39454"
    },
    {
      "type": "WEB",
      "url": "https://jvn.jp/en/jp/JVN63376363"
    },
    {
      "type": "WEB",
      "url": "https://www.skyseaclientview.net/news/260420_01"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

JVNDB-2026-000051

Vulnerability from jvndb - Published: 2026-04-20 05:47 - Updated:2026-04-20 05:47

Severity

7.8 (High) - cvssV3_0 - CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

SKYSEA Client View and SKYMEC IT Manager improper file access permission settings

Details

SKYSEA Client View and SKYMEC IT Manager provided by Sky Co.,LTD. are Enterprise IT Asset Management Tools. SKYSEA Client View and SKYMEC IT Manager contain the following vulnerability.

Incorrect default permissions in the installation folder (CWE-276) - CVE-2026-39454

Takashi Matsumoto of NEC Corporation reported this vulnerability to Sky Co.,LTD. and coordinated. After the coordination was completed, Sky Co.,LTD. reported the case to JPCERT/CC to notify users of the solution through JVN.

References

Type

URL

	JVN	https://jvn.jp/en/jp/JVN63376363/index.html
	CVE	https://www.cve.org/CVERecord?id=CVE-2026-39454
	No Mapping(CWE-Other)	https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html

Impacted products

Vendor

Product

	Sky Co., LTD.	SKYMEC IT Manager
	Sky Co., LTD.	SKYSEA Client View

Show details on JVN DB website

JSON

To clipboard

{
  "@rdf:about": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000051.html",
  "dc:date": "2026-04-20T14:47+09:00",
  "dcterms:issued": "2026-04-20T14:47+09:00",
  "dcterms:modified": "2026-04-20T14:47+09:00",
  "description": "SKYSEA Client View and SKYMEC IT Manager provided by Sky Co.,LTD. are Enterprise IT Asset Management Tools.\r\nSKYSEA Client View and SKYMEC IT Manager contain the following vulnerability.\u003ca href=\u0027https://cwe.mitre.org/data/definitions/276.html\u0027 target=\u0027_blank\u0027\u003e\u003c/a\u003e\u003cul\u003e\u003cli\u003eIncorrect default permissions in the installation folder (CWE-276) - CVE-2026-39454\u003c/li\u003e\u003c/ul\u003eTakashi Matsumoto of NEC Corporation reported this vulnerability to Sky Co.,LTD. and coordinated. After the coordination was completed, Sky Co.,LTD. reported the case to JPCERT/CC to notify users of the solution through JVN.",
  "link": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000051.html",
  "sec:cpe": [
    {
      "#text": "cpe:/a:skygroup:skymec_it_manager",
      "@product": "SKYMEC IT Manager",
      "@vendor": "Sky Co., LTD.",
      "@version": "2.2"
    },
    {
      "#text": "cpe:/a:skygroup:skysea_client_view",
      "@product": "SKYSEA Client View",
      "@vendor": "Sky Co., LTD.",
      "@version": "2.2"
    }
  ],
  "sec:cvss": {
    "@score": "7.8",
    "@severity": "High",
    "@type": "Base",
    "@vector": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "@version": "3.0"
  },
  "sec:identifier": "JVNDB-2026-000051",
  "sec:references": [
    {
      "#text": "https://jvn.jp/en/jp/JVN63376363/index.html",
      "@id": "JVN#63376363",
      "@source": "JVN"
    },
    {
      "#text": "https://www.cve.org/CVERecord?id=CVE-2026-39454",
      "@id": "CVE-2026-39454",
      "@source": "CVE"
    },
    {
      "#text": "https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html",
      "@id": "CWE-Other",
      "@title": "No Mapping(CWE-Other)"
    }
  ],
  "title": "SKYSEA Client View and SKYMEC IT Manager improper file access permission settings"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Action not permitted

CVE-2026-39454 (GCVE-0-2026-39454)

FKIE_CVE-2026-39454

GHSA-3224-28WC-WHRH

JVNDB-2026-000051

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