Vulnerability-Lookup

JVNDB-2026-000067

Vulnerability from jvndb - Published: 2026-05-11 09:20 - Updated:2026-05-11 09:20

Severity

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

Summary

"Kura Sushi Official App" vulnerable to improper certificate validation

Details

"Kura Sushi Official App" provided by EPG, Inc. contains the following vulnerability.

Improper certificate validation on push notifications (CWE-295) - CVE-2026-41872

This analysis assumes a man-in-the-middle attack being conducted with a malicious wireless LAN access point

Tsuyoshi Ogawa of SAK University SIE Co., Ltd. reported this vulnerability to IPA.JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

References

Type

URL

	JVN	https://jvn.jp/en/jp/JVN38632731/index.html
	CVE	https://www.cve.org/CVERecord?id=CVE-2026-41872
	No Mapping(CWE-Other)	https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html

Impacted products

Vendor

Product

	EPG, Inc.	Kura Sushi Official App for Android
	EPG, Inc.	Kura Sushi Official App for iOS

Show details on JVN DB website

JSON

To clipboard

{
  "@rdf:about": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000067.html",
  "dc:date": "2026-05-11T18:20+09:00",
  "dcterms:issued": "2026-05-11T18:20+09:00",
  "dcterms:modified": "2026-05-11T18:20+09:00",
  "description": "\"Kura Sushi Official App\" provided by EPG, Inc. contains the following vulnerability.\u003ca href=\u0027https://cwe.mitre.org/data/definitions/295.html\u0027 target=\u0027_blank\u0027\u003e\u003c/a\u003e\u003cul\u003e\u003cli\u003eImproper certificate validation on push notifications (CWE-295) - CVE-2026-41872\u003c/li\u003e\u003cul\u003e\u003cli\u003eThis analysis assumes a man-in-the-middle attack being conducted with a malicious wireless LAN access point\u003c/li\u003e\u003c/ul\u003e\u003c/ul\u003eTsuyoshi Ogawa of SAK University SIE Co., Ltd. reported this vulnerability to IPA.JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.",
  "link": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000067.html",
  "sec:cpe": [
    {
      "#text": "cpe:/a:misc:epg_kura_sushi_official_app_for_android",
      "@product": "Kura Sushi Official App for Android",
      "@vendor": "EPG, Inc.",
      "@version": "2.2"
    },
    {
      "#text": "cpe:/a:misc:epg_kura_sushi_official_app_for_ios",
      "@product": "Kura Sushi Official App for iOS",
      "@vendor": "EPG, Inc.",
      "@version": "2.2"
    }
  ],
  "sec:cvss": {
    "@score": "7.4",
    "@severity": "High",
    "@type": "Base",
    "@vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
    "@version": "3.0"
  },
  "sec:identifier": "JVNDB-2026-000067",
  "sec:references": [
    {
      "#text": "https://jvn.jp/en/jp/JVN38632731/index.html",
      "@id": "JVN#38632731",
      "@source": "JVN"
    },
    {
      "#text": "https://www.cve.org/CVERecord?id=CVE-2026-41872",
      "@id": "CVE-2026-41872",
      "@source": "CVE"
    },
    {
      "#text": "https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html",
      "@id": "CWE-Other",
      "@title": "No Mapping(CWE-Other)"
    }
  ],
  "title": "\"Kura Sushi Official App\" vulnerable to improper certificate validation"
}

CVE-2026-41872 (GCVE-0-2026-41872)

Vulnerability from cvelistv5 – Published: 2026-05-12 05:21 – Updated: 2026-05-12 13:17

Summary

"Kura Sushi Official App" provided by EPG, Inc. is vulnerable to improper certificate validation. A man-in-the-middle attack may allow eavesdropping on, or altering, the communication on push notifications between the affected application and the relevant server.

Severity

7.4 (High)


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

9.1 (Critical)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-12 13:17 UTC

CWE

CWE-295 - Improper certificate validation

Assigner

jpcert jpcert root

References

3 references

URL	Tags
https://play.google.com/store/apps/details?id=jp.…
https://apps.apple.com/jp/app/id942355925
https://jvn.jp/en/jp/JVN38632731/

Impacted products

2 products

Vendor	Product	Version
EPG, Inc.	"Kura Sushi Official App" for Android	Affected: from 2.0.11 to 3.9.10
EPG, Inc.	"Kura Sushi Official App" for iOS	Affected: from 2.0.11 to 3.9.10

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-41872",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-12T13:17:31.269899Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-12T13:17:40.535Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "\"Kura Sushi Official App\" for Android",
          "vendor": "EPG, Inc.",
          "versions": [
            {
              "status": "affected",
              "version": "from 2.0.11 to 3.9.10"
            }
          ]
        },
        {
          "product": "\"Kura Sushi Official App\" for iOS",
          "vendor": "EPG, Inc.",
          "versions": [
            {
              "status": "affected",
              "version": "from 2.0.11 to 3.9.10"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "\"Kura Sushi Official App\" provided by EPG, Inc. is vulnerable to improper certificate validation. A man-in-the-middle attack may allow eavesdropping on, or altering, the communication on push notifications between the affected application and the relevant server."
        }
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en-US",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-295",
              "description": "Improper certificate validation",
              "lang": "en-US",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-12T05:21:42.802Z",
        "orgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
        "shortName": "jpcert"
      },
      "references": [
        {
          "url": "https://play.google.com/store/apps/details?id=jp.co.kura_corpo\u0026hl=ja"
        },
        {
          "url": "https://apps.apple.com/jp/app/id942355925"
        },
        {
          "url": "https://jvn.jp/en/jp/JVN38632731/"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
    "assignerShortName": "jpcert",
    "cveId": "CVE-2026-41872",
    "datePublished": "2026-05-12T05:21:42.802Z",
    "dateReserved": "2026-04-22T07:25:34.140Z",
    "dateUpdated": "2026-05-12T13:17:40.535Z",
    "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.