CVE-2026-29179
LowCVSS 3.3Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
In October CMS prior to 3.7.16 and 4.1.16, fine-grained sub-permission checks for asset and blueprint file operations were not enforced in the CMS and Tailor editor extensions. Backend users granted editor access but explicitly denied editor.cms_assets or editor.tailor_blueprints could still create, delete, rename, move, and upload files. A related operator precedence error in Tailor navigation also disclosed the theme blueprint directory tree.
Risk Assessment
A user with restricted permissions can modify or delete theme assets and blueprint files, potentially leading to unauthorized changes to site appearance and configuration and disclosure of directory structure.
Recommendation
Update October CMS to version 3.7.16 or 4.1.16. Review editor permission configuration for the withholding of editor.cms_assets and editor.tailor_blueprints sub-permissions.
Other vulnerabilities in October CMS
See all- CVE-2026-101005High
A vulnerability was detected in October CMS up to 4.3.4. This affects the function validateExternalImageHost of the file System/Classes/ResizeImages.php of the component SSRF Protection. The manipulation results in server-side request forgery. The attack may be launched remotely, and the exploit is now public.
- CVE-2017-16941High
October CMS through 1.0.428 does not prevent the use of .htaccess in themes, allowing remote authenticated users to execute arbitrary PHP code by downloading a theme ZIP archive from /backend/cms/themes, and then uploading and importing a modified archive with two new files: a .php file and a .htaccess file.
- CVE-2017-1000195High
October CMS version 412 is vulnerable to PHP object injection in asset move functionality, allowing for the deletion of files limited by file permissions on the server.
- CVE-2017-1000119High
October CMS version 412 is vulnerable to PHP code execution in the file upload functionality, potentially leading to site compromise and possibly affecting other applications on the server.
- CVE-2021-32648HighActively exploited
A vulnerability in the october/system package of October CMS allows an attacker to request an account password reset and then gain access to the account using a specially crafted request. The issue has been patched in Build 472 and v1.1.5.
- CVE-2017-1000197Critical
October CMS version 412 is vulnerable to file path modification in asset move functionality, potentially allowing the creation of malicious files on the server.
- CVE-2017-1000196Critical
October CMS version 412 is vulnerable to PHP code execution in the asset manager functionality, potentially leading to site compromise and possibly affecting other applications on the server.
- CVE-2017-1000194Critical
October CMS build 412 is vulnerable to Apache configuration modification via file upload functionality, potentially leading to site compromise and affecting other applications on the server.
- CVE-2026-49400Low
October CMS versions prior to 3.7.17 and 4.2.21 contain a PHP object injection vulnerability in the system module. The backend `SessionMaker` trait stored widget session state as `base64(serialize(...))` and consumed it with `unserialize()` without an `allowed_classes` restriction, allowing attacker-controlled bytes to trigger object injection and reachable PHP gadget chains. This issue only affects installations with `cms.safe_mode` enabled, which is an opt-in feature for demo or multi-tenant scenarios.
- CVE-2026-46696Low
A vulnerability in the October CMS system module's Twig sandbox security policy allowed a chained bypass when cms.safe_mode is enabled. By combining unrestricted access to the Laravel session store with unblocked raw SQL methods reachable through Eloquent's __call forwarding, a backend user with CMS markup editing access could read arbitrary database values and write to the backend authentication session key, forging a session as another existing user. The issue is patched in versions 3.7.17 and 4.2.21.
Original NVD description (English source)
October is a Content Management System (CMS) and web platform. Prior to 3.7.16 and 4.1.16, fine-grained sub-permission checks for asset and blueprint file operations were not enforced in the CMS and Tailor editor extensions. This only affects backend users who were explicitly granted editor access but had editor.cms_assets or editor.tailor_blueprints specifically withheld, an uncommon permission configuration. In this edge case, such users could perform file operations (create, delete, rename, move, upload) on theme assets or blueprint files despite lacking the required sub-permission. A related operator precedence error in the Tailor navigation also disclosed the theme blueprint directory tree under the same conditions. This vulnerability is fixed in 3.7.16 and 4.1.16.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS