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Advisory severityMedium4.6Red Hat Linux

Medium [CVE-2026-73428] Stored Cross-Site Scripting via HTML paste allows arbitrary code execution.

This medium-severity Red Hat Linux advisory covers CVE-2026-73428.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-73428 Source published Source updated

VulniPulse record published Record updated

CVE-2026-73428
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

Trix is a what-you-see-is-what-you-get rich text editor for everyday writing. Prior to 2.1.18, Trix is vulnerable to stored cross-site scripting when crafted HTML is pasted into the editor.

HTMLParser processes a mock attachment in a `` with an empty `data-trix-attachment="{}"` value, causing data-trix-attributes to be applied to a plain string piece. StringPiece.fromJSON accepts an unvalidated href, allowing a javascript: URI to enter the document model and serialized HTML and execute when another user renders and clicks the content.

Applications that apply server-side HTML sanitization can neutralize the payload on save. This issue is fixed in version 2.1.18.

This allows a malicious javascript: Uniform Resource Identifier (URI) to be embedded, which can then execute arbitrary code in the victim's browser when another user renders and clicks the content. No Red Hat products ship a vulnerable version of this component.

Red Hat severity: Moderate — CVSS 4.6 (CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N). Weakness: CWE-79.

Affected versions
  • < 2.1.18

Official advisory · high-confidence parse· fetched 29 days ago·verify at source

Fixed versions
  • 2.1.18

Official advisory · high-confidence parse· fetched 29 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Applications that apply server-side HTML sanitization can neutralize the XSS payload on save, preventing exploitation even on unpatched versions of Trix.

Official advisory · high-confidence parse· fetched 29 days ago·verify at source

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