CVE-2026-58504

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 v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
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

Configurations

No configuration.

History

29 Sep 2026, 16:17

Type	Values Removed	Values Added
References	~~() https://github.com/jgraph/drawio/security/advisories/GHSA-c76x-r78m-phwx -~~	() https://github.com/jgraph/drawio/security/advisories/GHSA-c76x-r78m-phwx -

21 Sep 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-09-21 17:17

Updated : 2026-09-29 16:17

NVD link : CVE-2026-58504

Mitre link : CVE-2026-58504

CVE.ORG link : CVE-2026-58504

JSON object : View

Products Affected

No product.

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CWE-116

Improper Encoding or Escaping of Output

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