CVE-2020-26231 Explained : Impact and Mitigation
Learn about CVE-2020-26231, a vulnerability in OctoberCMS allowing authenticated users to execute arbitrary PHP code. Find out the impact, affected systems, and mitigation steps.
October is a free, open-source, self-hosted CMS platform based on the Laravel PHP Framework. A bypass of CVE-2020-15247 (fixed in 1.0.469 and 1.1.0) was discovered that has the same impact as CVE-2020-15247. An authenticated backend user with specific permissions can escape the Twig sandbox and execute arbitrary PHP.
Understanding CVE-2020-26231
This CVE involves a bypass of a fix for CVE-2020-15247, allowing authenticated users to execute arbitrary PHP code.
What is CVE-2020-26231?
CVE-2020-26231 is a vulnerability in OctoberCMS that enables authenticated users to bypass security measures and execute arbitrary PHP code.
The Impact of CVE-2020-26231
- CVSS Score: 5.2 (Medium Severity)
- Attack Vector: Local
- Privileges Required: High
- User Interaction: Required
- Scope: Changed
- Availability Impact: Low
- Confidentiality Impact: Low
- Integrity Impact: Low
- The vulnerability allows users with specific permissions to escape the Twig sandbox and run PHP code, potentially leading to unauthorized actions.
Technical Details of CVE-2020-26231
This section provides detailed technical information about the vulnerability.
Vulnerability Description
- The issue allows authenticated backend users to execute arbitrary PHP code by bypassing security controls.
Affected Systems and Versions
- Product: October
- Vendor: OctoberCMS
- Affected Version: 1.0.469
Exploitation Mechanism
- Authenticated backend users with certain permissions can write specific Twig code to escape the sandbox and execute PHP code.
Mitigation and Prevention
Protect your systems from CVE-2020-26231 with the following steps:
Immediate Steps to Take
- Update OctoberCMS to Build 470 (v1.0.470) or v1.1.1 to patch the vulnerability.
- Review and adjust user permissions to limit access to sensitive functionalities.
Long-Term Security Practices
- Regularly review and update CMS security configurations.
- Educate users on secure coding practices and the risks of executing arbitrary code.
Patching and Updates
- Stay informed about security advisories and promptly apply patches and updates to the CMS.