Code Injection in October CMS - CVE-2021-21264
Published: May 3, 2021
Vulnerability identifier: #VU52790
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-21264
CWE-ID: CWE-94
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to execute arbitrary PHP code on the target system.
The vulnerability exists due to incomplete patch implementation for previously patched vulnerabilities #VU48707 and #VU48710. A remote authenticated user with the cms.manage_pages, cms.manage_layouts, or cms.manage_partials permissions can write specific Twig code to escape the Twig sandbox and execute arbitrary PHP.
Affected software
October CMS
How to mitigate CVE-2021-21264
Install updates from vendor's website.
October CMS - addressed in versions 1.0.472, 1.1.2