Access Control Bypass Affecting october/system package, versions <3.7.17>=4.0.0, <4.2.23
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Access Control Bypass vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-PHP-OCTOBERSYSTEM-20186845
- published28 Sept 2026
- disclosed14 Sept 2026
- creditUnknown
Introduced: 14 Sep 2026
NewCVE-2026-46696 (opens in a new tab)How to fix?
Upgrade october/system to version 3.7.17, 4.2.23 or higher.
Overview
october/system is a System module for October CMS.
Affected versions of this package are vulnerable to Access Control Bypass in the cms.safe_mode process. An attacker can gain unauthorized access to sensitive database information and impersonate other backend users by chaining method calls in Twig templates to bypass sandbox restrictions and execute raw SQL expressions. This is only exploitable if cms.safe_mode is enabled, a backend user with CMS markup editing access exists who is not intended to be a full administrator, and there is at least one existing superuser account whose session can be impersonated.
Workaround
This vulnerability can be mitigated by restricting CMS markup editing access to fully trusted administrators only.