What’s Vulnerable › Vulnerabilities

CVE-2026-44311: Fabric.js: Improper escaping in fabric.Gradient colorStops leads to XSS in SVG serialization

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-22 · updated 2026-10-25
• Weakness: CWE-79

Description

Fabric.js is a Javascript HTML5 canvas library. Prior to 7.4.0, a potential Cross-Site Scripting (XSS) vulnerability exists in Fabric.js due to improper escaping of user-controlled input during SVG serialization via the toSVG() method. Specifically, the color field within the colorStops array of a fabric.Gradient object is not properly escaped when converted into SVG <stop> elements. If an application renders the generated SVG string into the DOM, this may allow an attacker to inject arbitrary HTML/SVG and execute JavaScript in the victim's browser. This vulnerability is fixed in 7.4.0.

Affected products

• fabricjs fabric.js: before 7.4.0 — fixed in 7.4.0

How to fix

Upgrade to a fixed version: fabricjs fabric.js 7.4.0. Check the vendor advisory for mitigations.

References

• https://github.com/fabricjs/fabric.js/releases/tag/v740
• https://github.com/fabricjs/fabric.js/security/advisories/GHSA-w22m-hvvm-xmwx
• https://github.com/fabricjs/fabric.js/security/advisories/GHSA-w22m-hvvm-xmwx

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