XSS in Fabricjs Fabric.js
CVE-2026-27013
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (30.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 30th percentile — 30.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Fabricjs Fabric.js — versions < 7.2.0
Weakness classification (CWE)
References
- github.com/fabricjs/fabric.js/security/advisories/GHSA-hfvx-25r5-qc3w (Exploit, Patch, Vendor Advisory)
- github.com/fabricjs/fabric.js/commit/7e1a122defd8feefe4eb7eaf0c180d7b0aeb6fee (Patch)
- github.com/fabricjs/fabric.js/releases/tag/v720 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-27013?
- CVE-2026-27013 is a high-severity vulnerability in Fabricjs Fabric.js, classified under Cross-site Scripting. CVSS score: 7.6/10. Published 2026-02-19.
- How severe is CVE-2026-27013?
- High severity. CVSS v3 base score is 7.6 out of 10.