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CVE-2026-56383 craftcms CVE debrief

CVE-2026-56383 is a stored cross-site scripting (XSS) vulnerability in Craft CMS, specifically 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. Defenders should prioritize patching due to the medium CVSS score of 4.6 and the potential for user-impacting XSS attacks.

Vendor
craftcms
Product
cms
CVSS
MEDIUM 4.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-21
Original CVE updated
2026-06-23
Advisory published
2026-06-21
Advisory updated
2026-06-23

Who should care

Defenders managing Craft CMS installations should prioritize this vulnerability. Specifically, administrators with allowAdminChanges enabled are at risk of exploitation. Given the medium severity and potential impact, all users of affected Craft CMS versions should assess their exposure and take action.

Technical summary

The CVE-2026-56383 vulnerability is a stored XSS issue within the editableTable.twig component of Craft CMS. The 'Row Heading' column type does not properly sanitize input, allowing administrators with allowAdminChanges enabled to inject malicious JavaScript. This JavaScript executes when other users view pages containing the affected table field. The vulnerability exists in versions >= 4.5.0-beta.1 through 4.16.18 and >= 5.0.0-RC1 through 5.8.22, with fixes in 4.16.19 and 5.8.23. The CVSS score is 4.6, indicating a medium severity level.

Defensive priority

Medium priority due to potential user-impacting XSS attacks with CVSS score of 4.6

Recommended defensive actions

  • Apply patches: Upgrade to Craft CMS version 4.16.19 or 5.8.23, whichever is applicable.
  • Inventory and assess exposure: Identify and review Craft CMS installations, especially those with administrator accounts that have allowAdminChanges enabled.
  • Official advisory review: Consult the Craft CMS security advisory for detailed information and potential workarounds.
  • Limit exposure: Consider temporarily disabling the editableTable.twig component or restricting administrator access until patches can be applied.
  • Monitor for suspicious activity: Keep an eye on Craft CMS installations for any signs of exploitation attempts or anomalous behavior.

Evidence notes

The primary evidence for CVE-2026-56383 comes from the NVD and Craft CMS security advisories. The vulnerability affects Craft CMS versions >= 4.5.0-beta.1 through 4.16.18 and >= 5.0.0-RC1 through 5.8.22. Defenders should verify their installations against these version ranges and review official advisories for specific details on affected components and potential mitigations.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56383 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56383

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-56383 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56383

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.