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

Severity: medium (CVSS 4.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-21 · updated 2026-10-25
Weakness: CWE-79

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.

Affected products

craftcms cms: from 4.5.0-beta.1 before 4.16.19; from 5.0.0-RC1 before 5.8.23 — fixed in 4.16.19, 5.8.23

How to fix

Upgrade to a fixed version: craftcms cms 4.16.19, 5.8.23. Check the vendor advisory for mitigations.

References

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