Vulnerability · Published Jun 21, 2026 · Assigned by VulnCheck
CVE-2026-56393Craft CMS - Multiple Stored Cross-Site Scripting in Settings Names and Field Options
Medium 4.8
In plain English
A medium-severity cross-site scripting in cms from craftcms. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Craft CMS 4.x (>= 4.0.0-RC1, < 4.17.0-beta.1) and 5.x (>= 5.0.0-RC1, < 5.9.0-beta.1) contain multiple stored cross-site scripting vulnerabilities where settings names and field option labels are rendered without sanitization (e.g., via the checkbox.twig template, which used {{ label|raw }}). An authenticated administrator (with allowAdminChanges enabled) can inject malicious payloads into section names, volume names, user group names, global set names, generated field names, checkbox/radio option labels, and custom source labels, causing arbitrary JavaScript to execute in other users' control-panel sessions. Fixed in 4.17.0-beta.1 and 5.9.0-beta.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Packagist | craftcms/cms | 5.9.0-beta.1 | GHSA-4mgv-366x-qxvx |
| Packagist | craftcms/cms | 4.17.0-beta.1 | GHSA-4mgv-366x-qxvx |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
References
- GHSA Advisory GHSA-4mgv-366x-qxvx vendor-advisory
- https://github.com/craftcms/cms/commit/943152d2246b36f12adf161a03b8695b773d9276 patch
- https://github.com/craftcms/cms/commit/67780a778c6ec04e68e64a0b1177c168306144a2 patch
- VulnCheck Advisory: Craft CMS - Multiple Stored Cross-Site Scripting in Settings Names and Field Options third-party-advisory