FKIE_CVE-2026-41591

Vulnerability from fkie_nvd - Published: 2026-05-08 16:16 - Updated: 2026-08-26 19:16
Severity
6.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Summary
Marko is a declarative, HTML-based language for building web apps. Prior to marko version 5.38.36 and prior to @marko/runtime-tags 6.0.164, when dynamic text is interpolated into a <script> or <style> tag the Marko runtime failed to prevent tag breakout when the closing tag used non-lowercase casing. An attacker able to place input inside a <script> or <style> block could break out of the tag with </SCRIPT>, </Style>, etc. and inject arbitrary HTML/JavaScript, resulting in cross-site scripting. This issue has been patched in marko version 5.38.36 and @marko/runtime-tags 6.0.164.
References
security-advisories@github.comhttps://github.com/marko-js/marko/security/advisories/GHSA-x9fj-57fh-c8wqExploit, Mitigation, Patch, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/marko-js/marko/security/advisories/GHSA-x9fj-57fh-c8wqExploit, Mitigation, Patch, Vendor Advisory
Impacted products
Vendor Product Version
openjsf marko *
openjsf marko\/runtime-tags *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "marko",
          "vendor": "marko-js",
          "versions": [
            {
              "status": "affected",
              "version": "marko \u003c 5.38.36"
            },
            {
              "status": "affected",
              "version": "@marko/runtime-tags \u003c 6.0.164"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:openjsf:marko:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "60D716B5-7A18-4E7F-8C4E-F9972CAD5670",
              "versionEndExcluding": "5.38.36",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:openjsf:marko\\/runtime-tags:*:*:*:*:*:node.js:*:*",
              "matchCriteriaId": "C2874484-F77A-413F-B073-EAB1F5E19CCF",
              "versionEndExcluding": "6.0.164",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Marko is a declarative, HTML-based language for building web apps. Prior to marko version 5.38.36 and prior to @marko/runtime-tags 6.0.164, when dynamic text is interpolated into a \u003cscript\u003e or \u003cstyle\u003e tag the Marko runtime failed to prevent tag breakout when the closing tag used non-lowercase casing. An attacker able to place input inside a \u003cscript\u003e or \u003cstyle\u003e block could break out of the tag with \u003c/SCRIPT\u003e, \u003c/Style\u003e, etc. and inject arbitrary HTML/JavaScript, resulting in cross-site scripting. This issue has been patched in marko version 5.38.36 and @marko/runtime-tags 6.0.164."
    }
  ],
  "id": "CVE-2026-41591",
  "lastModified": "2026-08-26T19:16:01.883",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 2.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-41591",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-08T17:08:43.350843Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-08T16:16:11.167",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Mitigation",
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/marko-js/marko/security/advisories/GHSA-x9fj-57fh-c8wq"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "tags": [
        "Exploit",
        "Mitigation",
        "Patch",
        "Vendor Advisory"
      ],
      "url": "https://github.com/marko-js/marko/security/advisories/GHSA-x9fj-57fh-c8wq"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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