CVE-2026-58504
mediumdraw.io is a configurable diagramming and whiteboarding application.
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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/jgraph/drawio/commit/7976c02e1b10b1687c028d82782f9f5d90a885d6 security-advisories@github.com
- https://github.com/jgraph/drawio/releases/tag/v30.2.5 security-advisories@github.com
- https://github.com/jgraph/drawio/security/advisories/GHSA-c76x-r78m-phwx security-advisories@github.com
- https://github.com/jgraph/drawio/security/advisories/GHSA-c76x-r78m-phwx 134c704f-9b21-4f2e-91b3-4a467353bcc0