Vulnerability-Lookup

GHSA-H4HV-92PP-PCJG

Vulnerability from github – Published: 2026-04-29 06:33 – Updated: 2026-05-06 22:09

Summary

CyberChef has a Cross-site Scripting issue

Details

GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.

Severity ?

7.2 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "npm",
        "name": "cyberchef"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "11.0.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-42615"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-06T22:09:27Z",
    "nvd_published_at": "2026-04-29T04:16:41Z",
    "severity": "HIGH"
  },
  "details": "GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets(\u0027%3Cscript substring.",
  "id": "GHSA-h4hv-92pp-pcjg",
  "modified": "2026-05-06T22:09:27Z",
  "published": "2026-04-29T06:33:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42615"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gchq/CyberChef/issues/2344"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gchq/CyberChef/pull/2346"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/gchq/CyberChef"
    },
    {
      "type": "WEB",
      "url": "https://github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "CyberChef has a Cross-site Scripting issue"
}

CVE-2026-42615 (GCVE-0-2026-42615)

Vulnerability from cvelistv5 – Published: 2026-04-29 02:55 – Updated: 2026-04-29 13:14

Summary

GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets('%3Cscript substring.

Severity ?

7.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CWE

CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')

Assigner

mitre

References

URL

Tags

	https://github.com/gchq/CyberChef/issues/2344
	https://github.com/gchq/CyberChef/commit/9641ae07…
	https://github.com/gchq/CyberChef/compare/v10.24.…
	https://github.com/gchq/CyberChef/pull/2346

Impacted products

	Vendor	Product	Version
	GCHQ	CyberChef	Affected: 0 , < 11.0.0 (semver)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42615",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-29T13:13:50.420380Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-29T13:14:40.068Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "CyberChef",
          "vendor": "GCHQ",
          "versions": [
            {
              "lessThan": "11.0.0",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:gchq:cyberchef:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "11.0.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "GCHQ CyberChef before 11.0.0 allows XSS via Show Base64 offsets, as demonstrated by the /#recipe=Show_Base64_offsets(\u0027%3Cscript substring."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.2,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N",
            "version": "3.1"
          },
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              "type": "CWE"
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-29T02:56:14.260Z",
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        "shortName": "mitre"
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      "references": [
        {
          "url": "https://github.com/gchq/CyberChef/issues/2344"
        },
        {
          "url": "https://github.com/gchq/CyberChef/commit/9641ae07f92e9af50f10e978385465b2f4a36c4d"
        },
        {
          "url": "https://github.com/gchq/CyberChef/compare/v10.24.0...v11.0.0"
        },
        {
          "url": "https://github.com/gchq/CyberChef/pull/2346"
        }
      ],
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2026-42615",
    "datePublished": "2026-04-29T02:55:53.171Z",
    "dateReserved": "2026-04-29T02:55:52.684Z",
    "dateUpdated": "2026-04-29T13:14:40.068Z",
    "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.

Action not permitted

GHSA-H4HV-92PP-PCJG

CVE-2026-42615 (GCVE-0-2026-42615)

Tags

Sightings

Nomenclature