CVE-2023-44382: October CMS safe mode bypass using Twig sandbox escape

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-01 · updated 2026-06-17
Weakness: CWE-94

Description

October is a Content Management System (CMS) and web platform to assist with development workflow. An authenticated backend user with the `editor.cms_pages`, `editor.cms_layouts`, or `editor.cms_partials` permissions who would normally not be permitted to provide PHP code to be executed by the CMS due to `cms.safe_mode` being enabled can write specific Twig code to escape the Twig sandbox and execute arbitrary PHP. This issue has been patched in 3.4.15.

Affected products

octobercms october: from 3.0.0 before 3.4.15 — fixed in 3.4.15

How to fix

Upgrade to a fixed version: octobercms october 3.4.15. Check the vendor advisory for mitigations.

References

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