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

> Authenticated attackers can read local files via path traversal in the assets/icon extension parameter of Craft CMS.

- **Severity:** High 7.1 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 21 Jun 2026
- **Updated:** 23 Jun 2026
- **Also known as:** GHSA-c43v-4cr8-6mvp

## What is CVE-2026-56394?

CVE-2026-56394 is a high-severity path traversal vulnerability in craftcms cms, published on 21 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-56394?

4 open source packages ship an affected version, including craftcms/cms.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `craftcms/cms` | Packagist | From 4.0.0-RC1 | 4.17.7 |
| `craftcms/cms` | Packagist | From 4.0.0-RC1 | 4.17.7 |
| `craftcms/cms` | Packagist | From 5.0.0-RC1 | 5.9.13 |
| `craftcms/cms` | Packagist | From 5.0.0-RC1 | 5.9.13 |

## How do I fix CVE-2026-56394?

Upgrade craftcms/cms to a fixed version for your release line: 4.17.7 or 5.9.13.

## Is CVE-2026-56394 being exploited?

There is no known exploitation of CVE-2026-56394 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-56394 and fix it if it is affected.

What it is: CVE-2026-56394 is a high-severity path traversal vulnerability in craftcms cms, published on 21 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-56394 in the wild and no public exploit code.

Affected packages and fixed versions:
- craftcms/cms (Packagist): affected from 4.0.0-RC1; fixed in 4.17.7
- craftcms/cms (Packagist): affected from 4.0.0-RC1; fixed in 4.17.7
- craftcms/cms (Packagist): affected from 5.0.0-RC1; fixed in 5.9.13
- craftcms/cms (Packagist): affected from 5.0.0-RC1; fixed in 5.9.13

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-56394/ (Markdown: https://insights.sbomify.com/CVE-2026-56394/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-56394
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-56394
- OSV: https://osv.dev/vulnerability/CVE-2026-56394

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-56394/
Summaries are generated and may contain mistakes; the official description above is the record.