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CVE-2026-58504— draw.io: Stored XSS on file open via editable=0 sibling cell — patch bypass of CVE-2026-46642

Quick assessment

Affected
jgraph drawio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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.addF

CVSS 6.1 · Medium EPSS 0.20% · P11

Affected Version Matrix 1

VendorProduct Version RangeStatus
jgraph drawio < 30.2.5 affected
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I. Basic Information for CVE-2026-58504

Vulnerability Information

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Vulnerability Title
draw.io: Stored XSS on file open via editable=0 sibling cell — patch bypass of CVE-2026-46642
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
jgraph drawio < 30.2.5 -

II. Public POCs for CVE-2026-58504

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III. Intelligence Information for CVE-2026-58504

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Other References for CVE-2026-58504 (2)

Same Patch Batch · jgraph · 2026-09-21 · 5 CVEs total

CVE-2026-76898 7.7 HIGH draw.io: Unauthenticated SSRF via IPv6 ULA blocklist bypass in /embed2.js
CVE-2026-63334 6.8 MEDIUM draw.io: SSRF via DNS rebinding in ProxyServlet bypasses private IP blocklist
CVE-2026-63373 4.2 MEDIUM draw.io: OAuth CSRF via missing state validation on self-hosted deployments allows session
CVE-2026-63416 3.7 LOW draw.io: Path traversal in ExportProxyServlet allows access to arbitrary backend endpoints

IV. Related Vulnerabilities

Same product: drawio
Same vendor: jgraph
Same weakness: CWE-79

V. Comments for CVE-2026-58504

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