LowGHSA-7pr4-wx9w-mqwrCVE-2026-25491

Craft CMS Vulnerable to Stored XSS in Entry Types Name

Published 9 Feb 2026 · Updated 9 Feb 2026

Affected package

craftcms/cmsComposer
Affected
>=5.0.0-RC1 <5.8.22
Fixed in
5.8.22
Update to the fixed version for your release line, for example:composer require craftcms/cms:^5.8.22

Details

Summary

Stored XSS via Entry Type names. The name is not sanitized when displayed in the Entry Types list.

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Proof of Concept

Required Permissions (Attacker)

  • Admin access (only admins have access to the settings page)
  • allowAdminChanges is enabled in production, which is against our security recommendations.

Steps to Reproduce

1. Log in as an attacker. 2. Go to Settings -> Entry Types (/admin/settings/entry-types). 3. Create a new Entry Type. 4. Set Name to:

<img src=x onerror="alert('XSS-EntryTypes')" hidden>

5. Save the Entry Type, and you’ll be redirected back to the entry types table automatically. 6. Notice the alert fires when the entry types table renders.

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.