CVE-2026-56394 craftcms CVE debrief

Who should care

Administrators and security teams responsible for Craft CMS installations should be aware of this vulnerability. Given the potential for data exposure, defenders should prioritize patching or mitigating this vulnerability. This vulnerability requires authentication, but the potential impact is still significant, especially if an attacker has obtained or can obtain valid credentials.

Technical summary

CVE-2026-56394 is an authenticated path traversal vulnerability in Craft CMS. The vulnerability exists in the assets/icon endpoint, where the extension parameter is not validated before file existence checks. Attackers can bypass extension validation by passing traversal sequences that resolve to existing SVG files, allowing local file read access. The vulnerability has a CVSS score of 7.1 and is classified as HIGH severity. The CVE record and NVD detail provide additional information about the vulnerability.

Defensive priority

High priority due to potential data exposure and authentication bypass

Recommended defensive actions

• Apply the official patch or update Craft CMS to a version that addresses this vulnerability.
• Review and limit access to the assets/icon endpoint to only necessary users.
• Monitor for suspicious activity related to file access and traversal attempts.
• Consider implementing additional security measures such as Web Application Firewalls (WAFs) to detect and prevent exploitation attempts.
• Inventory Craft CMS installations and verify that they are up-to-date with the latest security patches.

Evidence notes

The primary evidence for this vulnerability comes from the CVE record and NVD detail. The vulnerability affects Craft CMS versions from 4.0.0-RC1. The CVE record and source references provide additional information about the vulnerability. Defenders should verify the affected product and version from official sources.

Official resources