October CMS safe mode bypass using Twig sandbox escape

published 2023-11-29 2 y ago modified 2026-06-17 4 mo ago also GHSA-p8q3-h652-65vx , EUVD-2023-3005

cvss: 9.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 59%
public exploits: 0; none known

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.

Patch / fix

fixed in 2

packagist october/system 3.4.15
octobercms october 3.4.15

Exploit prediction

0.87% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
NVD	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
GitHub	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
packagist	october/system	>=3.0.0, <3.4.15	3.4.15

Affected products

octobercms october

Classification

Weakness

CWE-94 Improper Control of Generation of Code

References

github.com /octobercms/october/security/advisories/GHSA-p8q3-h652-65vx
web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2023-44382
advisory
github.com /octobercms/october
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary