Fabric.js improper escaping in fabric.Gradient colorStops leads to XSS in SVG serialization

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

5.4 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS

• CVE-2026-44311: 0.27% estimated exploitation activity in the next 30 days; percentile 19.57 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary 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 (e.g., via innerHTML), this may allow an attacker to inject arbitrary HTML/SVG and execute JavaScript in the victim's browser. Details During SVG export, Fabric.js serializes gradient color stops into <stop elements like: However, the color value is inserted into the stop-color attribute without proper escaping of special characters such as ", <, and . This allows crafted input to break out of the attribute context and inject arbitrary markup. For example: may result in: This breaks the intended SVG structure and introduces executable HTML. PoC (Proof of Concept) Successfully verified on v7.2.0…

Published by the source

12 Jun 2026, 21:00 UTC

Last modified by the source

18 Jul 2026, 17:30 UTC

Source last checked

26 Oct 2026, 12:57 UTC

1. Revision 2 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-w22m-hvvm-xmwx

2. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-w22m-hvvm-xmwx

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# Patch Next advisory brief: CVE-2026-44311

Advisory: Fabric.js improper escaping in fabric.Gradient colorStops leads to XSS in SVG serialization
IDs: CVE-2026-44311, GHSA-w22m-hvvm-xmwx
Record: https://patchnext.com/advisories/cve-2026-44311 (revision 2, source checked 26 Oct 2026, 12:57 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: fabric 7.4.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm fabric: affected < 7.4.0; fixed in 7.4.0

## Suggested inspection (read-only)
- `npm ls fabric --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on fabric.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-w22m-hvvm-xmwx (OSV record GHSA-w22m-hvvm-xmwx lists affected ranges: npm fabric >=0 <7.4.0 (fixed))
- Verified: https://github.com/advisories/GHSA-w22m-hvvm-xmwx (GitHub-reviewed advisory GHSA-w22m-hvvm-xmwx lists affected ranges: npm fabric >=0 <7.4.0)

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