Vulnerability Description
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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/jgraph/drawio/commit/7976c02e1b10b1687c028d82782f9f5d90a885d6
- https://github.com/jgraph/drawio/releases/tag/v30.2.5
- https://github.com/jgraph/drawio/security/advisories/GHSA-c76x-r78m-phwx
- https://github.com/jgraph/drawio/security/advisories/GHSA-c76x-r78m-phwx
FAQ
What is CVE-2026-58504?
CVE-2026-58504 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 orig...
How severe is CVE-2026-58504?
CVE-2026-58504 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-58504?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.