CVE-2026-58504 (GCVE-0-2026-58504)

Vulnerability from cvelistv5 – Published: 2026-09-21 16:15 – Updated: 2026-09-21 16:15
VLAI
Title
draw.io: Stored XSS on file open via editable=0 sibling cell — patch bypass of CVE-2026-46642
Summary
draw.io is a configurable diagramming and whiteboarding application. Prior to version 30.2.5, opening or importing a crafted .drawio file can execute attacker-controlled JavaScript in the draw.io origin when selected cells are processed by TextFormatPanel.addFont() in src/main/webapp/js/grapheditor/Format.js. An HTML sibling cell keeps the formatted-label path enabled while an editable=0 plain-text sibling is excluded from the merged selection style but remains in the iteration set. graph.cellRenderer.getLabelValue() returns that plain-text label without HTML encoding, and mxUtils.canConvertHtmlToSvg() parses it as HTML, bypassing the earlier CVE-2026-46642 remediation. Successful exploitation can expose diagram data, browser storage, non-HttpOnly cookies, and same-origin actions available to the victim. This issue is fixed in version 30.2.5.
Severity
6.1 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • CWE-116 - Improper Encoding or Escaping of Output
Assigner
References
Impacted products
Vendor Product Version CPE status
jgraph drawio Affected: < 30.2.5
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
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      "affected": [
        {
          "product": "drawio",
          "vendor": "jgraph",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 30.2.5"
            }
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      "descriptions": [
        {
          "lang": "en",
          "value": "draw.io is a configurable diagramming and whiteboarding application. Prior to version 30.2.5, opening or importing a crafted .drawio file can execute attacker-controlled JavaScript in the draw.io origin when selected cells are processed by TextFormatPanel.addFont() in src/main/webapp/js/grapheditor/Format.js. An HTML sibling cell keeps the formatted-label path enabled while an editable=0 plain-text sibling is excluded from the merged selection style but remains in the iteration set. graph.cellRenderer.getLabelValue() returns that plain-text label without HTML encoding, and mxUtils.canConvertHtmlToSvg() parses it as HTML, bypassing the earlier CVE-2026-46642 remediation. Successful exploitation can expose diagram data, browser storage, non-HttpOnly cookies, and same-origin actions available to the victim. This issue is fixed in version 30.2.5."
        }
      ],
      "metrics": [
        {
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.1,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
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            "version": "3.1"
          }
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-79",
              "description": "CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-116",
              "description": "CWE-116: Improper Encoding or Escaping of Output",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-21T16:15:30.398Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/jgraph/drawio/security/advisories/GHSA-c76x-r78m-phwx",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/jgraph/drawio/security/advisories/GHSA-c76x-r78m-phwx"
        },
        {
          "name": "https://github.com/jgraph/drawio/commit/7976c02e1b10b1687c028d82782f9f5d90a885d6",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jgraph/drawio/commit/7976c02e1b10b1687c028d82782f9f5d90a885d6"
        },
        {
          "name": "https://github.com/jgraph/drawio/releases/tag/v30.2.5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/jgraph/drawio/releases/tag/v30.2.5"
        }
      ],
      "source": {
        "advisory": "GHSA-c76x-r78m-phwx",
        "discovery": "UNKNOWN"
      },
      "title": "draw.io: Stored XSS on file open via editable=0 sibling cell \u2014 patch bypass of CVE-2026-46642"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-58504",
    "datePublished": "2026-09-21T16:15:30.398Z",
    "dateReserved": "2026-06-30T20:21:25.813Z",
    "dateUpdated": "2026-09-21T16:15:30.398Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-26",
      "epss": "0.00355",
      "percentile": "0.26651"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "product": "drawio",
                "vendor": "jgraph",
                "versions": [
                  {
                    "status": "affected",
                    "version": "\u003c 30.2.5"
                  }
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            "source": "security-advisories@github.com"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "draw.io is a configurable diagramming and whiteboarding application. Prior to version 30.2.5, opening or importing a crafted .drawio file can execute attacker-controlled JavaScript in the draw.io origin when selected cells are processed by TextFormatPanel.addFont() in src/main/webapp/js/grapheditor/Format.js. An HTML sibling cell keeps the formatted-label path enabled while an editable=0 plain-text sibling is excluded from the merged selection style but remains in the iteration set. graph.cellRenderer.getLabelValue() returns that plain-text label without HTML encoding, and mxUtils.canConvertHtmlToSvg() parses it as HTML, bypassing the earlier CVE-2026-46642 remediation. Successful exploitation can expose diagram data, browser storage, non-HttpOnly cookies, and same-origin actions available to the victim. This issue is fixed in version 30.2.5."
          }
        ],
        "id": "CVE-2026-58504",
        "lastModified": "2026-09-23T18:26:49.087",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
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                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
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                "userInteraction": "REQUIRED",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
                "version": "3.1"
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              "impactScore": 2.7,
              "source": "security-advisories@github.com",
              "type": "Secondary"
            }
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        },
        "published": "2026-09-21T17:17:36.077",
        "references": [
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            "url": "https://github.com/jgraph/drawio/commit/7976c02e1b10b1687c028d82782f9f5d90a885d6"
          },
          {
            "source": "security-advisories@github.com",
            "url": "https://github.com/jgraph/drawio/releases/tag/v30.2.5"
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            "url": "https://github.com/jgraph/drawio/security/advisories/GHSA-c76x-r78m-phwx"
          }
        ],
        "sourceIdentifier": "security-advisories@github.com",
        "vulnStatus": "Deferred",
        "weaknesses": [
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                "lang": "en",
                "value": "CWE-79"
              },
              {
                "lang": "en",
                "value": "CWE-116"
              }
            ],
            "source": "security-advisories@github.com",
            "type": "Primary"
          }
        ]
      }
    }
  }
}



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