Vulnerability-Lookup

JVNDB-2026-000075

Vulnerability from jvndb - Published: 2026-05-13 06:41 - Updated:2026-05-13 06:41

Severity

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

Summary

Bytello Share (Windows Edition) installer executable insecurely loads Dynamic Link Libraries

Details

GUARDIANWALL MailSuite provided by Canon Marketing Japan Inc. contains the following vulnerability.

Stack-based buffer overflow in pop3wallpasswd command (CWE-121) - CVE-2026-32661

The developer states that attacks exploiting the vulnerability has been observed in GUARDIANWALL MailSuite (On-premises version). Canon Marketing Japan Inc. reported this vulnerability to JPCERT/CC to notify users of its solution through JVN. JPCERT/CC and Canon Marketing Japan Inc. coordinated under the Information Security Early Warning Partnership.

References

Type

URL

	JVN	https://jvn.jp/en/jp/JVN98871848/index.html
	JVN	https://jvn.jp/en/ta/JVNTA91240916/
	CVE	https://www.cve.org/CVERecord?id=CVE-2026-44612
	No Mapping(CWE-Other)	https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html

Impacted products

Vendor

Product

Bytello Ltd.

Bytello Share (Windows Edition)

Show details on JVN DB website

JSON

To clipboard

{
  "@rdf:about": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000075.html",
  "dc:date": "2026-05-13T15:41+09:00",
  "dcterms:issued": "2026-05-13T15:41+09:00",
  "dcterms:modified": "2026-05-13T15:41+09:00",
  "description": "GUARDIANWALL MailSuite provided by Canon Marketing Japan Inc. contains the following vulnerability.  \u003ca href=\u0027https://cwe.mitre.org/data/definitions/121.html\u0027 target=\u0027_blank\u0027\u003e\u003c/a\u003e\r\n\u003cul\u003e\u003cli\u003eStack-based buffer overflow in pop3wallpasswd command (CWE-121) - CVE-2026-32661\u003c/li\u003e\u003c/ul\u003eThe developer states that attacks exploiting the vulnerability has been observed in GUARDIANWALL MailSuite (On-premises version).\r\n\r\nCanon Marketing Japan Inc. reported this vulnerability to JPCERT/CC to notify users of its solution through JVN.\r\nJPCERT/CC and Canon Marketing Japan Inc. coordinated under the Information Security Early Warning Partnership.",
  "link": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000075.html",
  "sec:cpe": {
    "#text": "cpe:/a:misc:bytello_bytello_share_for_windows",
    "@product": "Bytello Share (Windows Edition)",
    "@vendor": "Bytello Ltd.",
    "@version": "2.2"
  },
  "sec:cvss": {
    "@score": "7.8",
    "@severity": "High",
    "@type": "Base",
    "@vector": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
    "@version": "3.0"
  },
  "sec:identifier": "JVNDB-2026-000075",
  "sec:references": [
    {
      "#text": "https://jvn.jp/en/jp/JVN98871848/index.html",
      "@id": "JVN#98871848",
      "@source": "JVN"
    },
    {
      "#text": "https://jvn.jp/en/ta/JVNTA91240916/",
      "@id": "JVNTA#91240916",
      "@source": "JVN"
    },
    {
      "#text": "https://www.cve.org/CVERecord?id=CVE-2026-44612",
      "@id": "CVE-2026-44612",
      "@source": "CVE"
    },
    {
      "#text": "https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html",
      "@id": "CWE-Other",
      "@title": "No Mapping(CWE-Other)"
    }
  ],
  "title": "Bytello Share (Windows Edition) installer executable insecurely loads Dynamic Link Libraries"
}

CVE-2026-44612 (GCVE-0-2026-44612)

Vulnerability from cvelistv5 – Published: 2026-05-13 05:44 – Updated: 2026-05-13 10:49

Summary

Bytello Share (Windows Edition) installer executable provided by Bytello insecurely loads Dynamic Link Libraries. If there is a crafted DLL at the same directory when invoking the affected installer, arbitrary code may be executed with the privilege of the user invoking the installer.

Severity

7.8 (High)


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

8.4 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/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 2026-05-13 10:43 UTC

CWE

CWE-427 - Uncontrolled Search Path Element

Assigner

jpcert jpcert root

References

2 references

URL	Tags
https://www.bytello.com/help/share/downloads
https://jvn.jp/en/jp/JVN98871848/

Impacted products

1 product

Vendor	Product	Version
Bytello	Bytello Share (Windows Edition) installer executable	Affected: prior to 5.13.0.4246

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-44612",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-13T10:43:52.710324Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-13T10:49:34.155Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Bytello Share (Windows Edition) installer executable",
          "vendor": "Bytello",
          "versions": [
            {
              "status": "affected",
              "version": "prior to 5.13.0.4246"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Bytello Share (Windows Edition) installer executable provided by Bytello insecurely loads Dynamic Link Libraries. If there is a crafted DLL at the same directory when invoking the affected installer, arbitrary code may be executed with the privilege of the user invoking the installer."
        }
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-427",
              "description": "Uncontrolled Search Path Element",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-13T05:44:01.819Z",
        "orgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
        "shortName": "jpcert"
      },
      "references": [
        {
          "url": "https://www.bytello.com/help/share/downloads"
        },
        {
          "url": "https://jvn.jp/en/jp/JVN98871848/"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
    "assignerShortName": "jpcert",
    "cveId": "CVE-2026-44612",
    "datePublished": "2026-05-13T05:44:01.819Z",
    "dateReserved": "2026-05-07T06:22:30.124Z",
    "dateUpdated": "2026-05-13T10:49:34.155Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.