Vulnerability-Lookup

JVNDB-2026-000060

Vulnerability from jvndb - Published: 2026-04-22 15:45 - Updated:2026-04-22 15:45

Severity ?

6.1 (Medium) - cvssV3_0 - CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Summary

DeepL Chrome browser extension vulnerable to cross-site scripting

Details

DeepL Chrome browser extension contains the following vulnerability.

Cross-site scripting (CWE-79) - CVE-2026-40451

This vulnerability was reported by the researchers below and JPCERT/CC coordinated with the developer. Junki Yuasa of Cybozu, Inc. reported this vulnerability to JPCERT/CC. Keitaro Yamazaki of GMO Cybersecurity by Ierae reported this vulnerability to IPA under Information Security Early Warning Partnership.

References

Type

URL

	JVN	https://jvn.jp/en/jp/JVN37524771/index.html
	CVE	https://www.cve.org/CVERecord?id=CVE-2026-40451
	Cross-site Scripting(CWE-79)	https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html

Impacted products

Vendor

Product

DeepL

Show details on JVN DB website

JSON

To clipboard

{
  "@rdf:about": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000060.html",
  "dc:date": "2026-04-22T15:45+09:00",
  "dcterms:issued": "2026-04-22T15:45+09:00",
  "dcterms:modified": "2026-04-22T15:45+09:00",
  "description": "DeepL Chrome browser extension contains the following vulnerability.\u003ca href=\u0027https://cwe.mitre.org/data/definitions/79.html\u0027 target=\u0027_blank\u0027\u003e\u003c/a\u003e\u003cul\u003e\u003cli\u003eCross-site scripting (CWE-79) - CVE-2026-40451\u003c/li\u003e\u003c/ul\u003eThis vulnerability was reported by the researchers below and JPCERT/CC coordinated with the developer.\r\nJunki Yuasa of Cybozu, Inc. reported this vulnerability to JPCERT/CC.\r\nKeitaro Yamazaki of GMO Cybersecurity by Ierae reported this vulnerability to IPA under Information Security Early Warning Partnership.",
  "link": "https://jvndb.jvn.jp/en/contents/2026/JVNDB-2026-000060.html",
  "sec:cpe": {
    "#text": "cpe:/a:misc:deepl_deepl",
    "@product": "DeepL",
    "@vendor": "DeepL",
    "@version": "2.2"
  },
  "sec:cvss": {
    "@score": "6.1",
    "@severity": "Medium",
    "@type": "Base",
    "@vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
    "@version": "3.0"
  },
  "sec:identifier": "JVNDB-2026-000060",
  "sec:references": [
    {
      "#text": "https://jvn.jp/en/jp/JVN37524771/index.html",
      "@id": "JVN#37524771",
      "@source": "JVN"
    },
    {
      "#text": "https://www.cve.org/CVERecord?id=CVE-2026-40451",
      "@id": "CVE-2026-40451",
      "@source": "CVE"
    },
    {
      "#text": "https://www.ipa.go.jp/en/security/vulnerabilities/cwe.html",
      "@id": "CWE-79",
      "@title": "Cross-site Scripting(CWE-79)"
    }
  ],
  "title": "DeepL Chrome browser extension vulnerable to cross-site scripting"
}

CVE-2026-40451 (GCVE-0-2026-40451)

Vulnerability from cvelistv5 – Published: 2026-04-22 04:28 – Updated: 2026-04-22 12:38

Summary

DeepL Chrome browser extension versions from v1.22.0 to v.1.23.0 contain a cross-site scripting vulnerability, which allows an attacker to execute arbitrary script in a user's browser, and inject malicious HTML into web pages viewed by the user.

Severity ?

6.1 (Medium)


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

5.1 (Medium)


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

CWE

CWE-79 - Cross-site scripting (XSS)

Assigner

jpcert

References

URL

Tags

	https://github.com/DeepLcom/deepl-chrome-extensio…
	https://jvn.jp/en/jp/JVN37524771/

Impacted products

	Vendor	Product	Version
	DeepL	Chrome browser extension	Affected: from v1.22.0 to v.1.23.0

Show details on NVD website

JSON

To clipboard

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  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40451",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T12:37:49.681344Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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    "cna": {
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        }
      ],
      "metrics": [
        {
          "cvssV3_0": {
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
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      },
      "references": [
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          "url": "https://github.com/DeepLcom/deepl-chrome-extension/security/advisories/GHSA-4x2r-q3p9-xhx4"
        },
        {
          "url": "https://jvn.jp/en/jp/JVN37524771/"
        }
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  },
  "cveMetadata": {
    "assignerOrgId": "ede6fdc4-6654-4307-a26d-3331c018e2ce",
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    "datePublished": "2026-04-22T04:28:49.657Z",
    "dateReserved": "2026-04-13T06:27:03.647Z",
    "dateUpdated": "2026-04-22T12:38:36.513Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

JVNDB-2026-000060

CVE-2026-40451 (GCVE-0-2026-40451)

Tags

Sightings

Nomenclature