CVE-2026-22692: October CMS Auth Bypass Vulnerability

CVE-2026-22692 Overview

October CMS, a popular Content Management System and web platform built on Laravel, contains a sandbox bypass vulnerability in its optional Twig safe mode feature (CMS_SAFE_MODE). Versions prior to 3.7.13 and versions 4.0.0 through 4.1.4 are affected by this vulnerability where certain methods on the collect() helper were not properly restricted, allowing authenticated users with template editing permissions to bypass sandbox protections.

Critical Impact

Authenticated backend users with CMS template editing permissions can bypass Twig sandbox protections to access restricted functionality, potentially leading to unauthorized data access or further exploitation.

Affected Products

• October CMS versions prior to 3.7.13
• October CMS versions 4.0.0 through 4.1.4
• Installations with CMS_SAFE_MODE enabled (disabled by default)

Discovery Timeline

• April 14, 2026 - CVE-2026-22692 published to NVD
• April 14, 2026 - Last updated in NVD database

Technical Details for CVE-2026-22692

Vulnerability Analysis

This vulnerability is classified as CWE-284 (Improper Access Control), specifically a sandbox bypass vulnerability affecting the Twig template engine's safe mode implementation in October CMS. The issue stems from insufficient restrictions on the collect() helper methods within the Twig sandbox environment.

When CMS_SAFE_MODE is enabled, October CMS implements a sandbox around Twig template execution to prevent untrusted users from executing dangerous operations. However, certain methods on Laravel's collect() helper were inadvertently left unrestricted, creating a bypass path that allows authenticated users to escape the intended sandbox constraints.

The vulnerability requires an attacker to have authenticated backend access with specific CMS template editing permissions. This limits the attack surface but still poses a significant risk in multi-tenant environments or scenarios where template editing is delegated to semi-trusted users.

Root Cause

The root cause lies in incomplete method restrictions within the Twig sandbox whitelist configuration. When implementing safe mode protections, the October CMS development team did not account for all potentially dangerous methods exposed through the collect() helper function. This oversight allows template editors to invoke methods that should be blocked under sandbox restrictions, effectively bypassing the security controls that CMS_SAFE_MODE is designed to enforce.

Attack Vector

The attack requires network access and authenticated backend permissions with template editing capabilities. An attacker with these privileges can craft malicious Twig templates that leverage the unrestricted collect() helper methods to escape the sandbox environment. Since this vulnerability affects sandbox bypass rather than direct code execution, the primary impact is unauthorized read access to sensitive data (high confidentiality impact) without affecting system integrity or availability.

The exploitation path involves:

1. Authenticating to the October CMS backend with template editing permissions
2. Creating or modifying a CMS template to include calls to unrestricted collect() methods
3. Triggering template rendering to execute the sandbox bypass
4. Accessing data or functionality that should be restricted by safe mode

Detection Methods for CVE-2026-22692

Indicators of Compromise

• Unusual or unexpected modifications to CMS templates in the October CMS backend
• Template code containing suspicious collect() method chains that appear designed to access restricted functionality
• Backend audit logs showing template edits from accounts that don't typically modify templates
• Error logs indicating sandbox violation attempts or unexpected method calls within templates

Detection Strategies

• Review backend user permissions to identify accounts with CMS template editing access
• Audit CMS templates for suspicious use of the collect() helper with uncommon method chains
• Monitor backend activity logs for template modifications, especially from newly created or compromised accounts
• Implement file integrity monitoring on template files to detect unauthorized changes

Monitoring Recommendations

• Enable comprehensive audit logging for all October CMS backend actions, particularly template operations
• Configure alerts for template modifications outside of normal change windows or by unusual user accounts
• Review the list of users with cms.manage_pages or similar template editing permissions regularly
• Consider implementing additional monitoring for environments where CMS_SAFE_MODE is enabled

How to Mitigate CVE-2026-22692

Immediate Actions Required

• Upgrade October CMS to version 3.7.13 or 4.1.5 or later immediately
• Review and restrict CMS template editing permissions to only fully trusted administrators
• Audit existing CMS templates for any suspicious collect() method usage
• Disable CMS_SAFE_MODE temporarily if untrusted template editing is not required until patches are applied

Patch Information

October CMS has released security patches addressing this vulnerability. Users should upgrade to the following versions:

• Version 3.7.13 - Fixes the sandbox bypass for the 3.x branch
• Version 4.1.5 - Fixes the sandbox bypass for the 4.x branch

For detailed information about the security fix, refer to the GitHub Security Advisory.

Workarounds

• Disable CMS_SAFE_MODE if the feature is not strictly required for your deployment
• Restrict CMS template editing permissions to only fully trusted administrators who do not require sandbox restrictions
• Implement additional access controls at the application or infrastructure level to limit backend access
• Consider temporarily revoking template editing permissions from semi-trusted users until patches are applied

# Configuration example for October CMS .env file
# Disable safe mode as a temporary workaround (if untrusted template editing is not required)
CMS_SAFE_MODE=false

# After patching, re-enable safe mode if needed
CMS_SAFE_MODE=true