Fabric.js is a Javascript HTML5 canvas library. Prior to version 7.2.0, Fabric.js applies escapeXml() to text content during SVG export (src/shapes/Text/TextSVGExportMixin.ts:186) but fails to apply it to other user-controlled string values that are interpolated into SVG attribute markup. When attacker-controlled JSON is loaded via loadFromJSON() and later exported via toSVG(), the unescaped values break out of XML attributes and inject arbitrary SVG elements including event handlers. Any application that accepts user-supplied JSON (via loadFromJSON(), collaborative sharing, import features, CMS plugins) and renders the toSVG() output in a browser context (SVG preview, export download rendered in-page, email template, embed) is vulnerable to stored XSS. An attacker can execute arbitrary JavaScript in the victim's browser session. Version 7.2.0 contains a fix.
Exploitability
AV:NAC:LPR:NUI:RScope
S:UImpact
C:HI:LA:L7.6/CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:LInjection
Input Validation