mxGraph vulnerable to cross-site scripting in color field
Summary
CVE-2019-13127: mxGraph vulnerable to cross-site scripting in color field. Affects mxgraph versions < 4.0.1. Fixed in 4.0.1. How to fix ↓
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mxGraph through 4.0.0, related to the draw.io Diagrams plugin before 8.3.14 for Confluence and other products, is vulnerable to cross-site scripting. draw.io Diagrams allows the creation and editing of draw.io-based diagrams in Confluence. Among other things, it allows to set the background color of text displayed in the diagram. The color provided by the user is notproperly sanitized, leading to HTML and JavaScript code to be displayed "as it is" to visitors of the page. This allows attackers to execute JavaScript code in the context of the visitor's browser and session and to e.g. run Confluence command under the visitor's user or attack the visitor's browser.
Proof of Concept (PoC):
- Create a new draw.io Diagram, add an element and edit its background color and enter some text to the element
- Enter the following "color":
onMouseOver=alert(1) a= - Save and view the resulting diagram, moving your mouse over the text
How To Fix
Latest published version: 4.2.2 as of 23 Oct 2026
npm install mxgraph@4.2.2Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
4.0.1
This is the first release that contains the fix.
npm install mxgraph@4.0.1Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
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