Cross-site Scripting (XSS) Affecting unleash package, versions <8.1.0-r2


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.19% (9th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-UNLEASH-19531028
  • published4 Sept 2026
  • disclosed1 Sept 2026

Introduced: 1 Sep 2026

NewCVE-2026-84371  (opens in a new tab)
CWE-79  (opens in a new tab)

How to fix?

Upgrade Chainguard unleash to version 8.1.0-r2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream unleash package and not the unleash package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. From version 1.9.0 until version 2.17.7, packages/sanitize-html/index.js validates an animation value attribute as one flat URL and does not recognize that attributeName selecting href or xlink:href gives the sibling values, from, to, or by attribute SVG SMIL URL semantics. In configurations that allow the animate, animateColor, animateMotion, animateTransform, or set elements, a values list can begin with a safe fragment and contain a later executable destination that survives allowedSchemesAppliedToAttributes checking. When the sanitized SVG is rendered, the browser can copy that later destination into the live link, and a victim who activates the link can execute script in the application's origin. This issue is fixed in version 2.17.7.

CVSS Base Scores

version 3.1