CVE-2026-49400 October CMS: PHP Object Injection via Backend Widget Session Storage

October System provides the system module for October Content Management System. Prior to versions 3.7.17 and 4.2.21, the backend SessionMaker trait stored widget session state as base64serialize... and consumed it with unserialize without an allowedclasses restriction. Any code path that could...

Deserialization of Untrusted Data

Overview october/system is a System module for October CMS. Affected versions of this package are vulnerable to Deserialization of Untrusted Data in the SessionMaker process. An attacker can execute arbitrary PHP code by injecting a crafted serialized payload into the widget. session key, which i...

Access Control Bypass

Overview october/system is a System module for October CMS. Affected versions of this package are vulnerable to Access Control Bypass in the cms.safemode process. An attacker can gain unauthorized access to sensitive database information and impersonate other backend users by chaining method call...

CVE-2026-46696: Improper Privilege Management

October System provides the system module for October Content Management System. Versions prior to 3.7.17 and 4.2.21 have a vulnerability in the Twig sandbox security policy that allowed a chained bypass when cms.safemode is enabled. The Laravel session store was exposed to Twig with unrestricted...

CVE-2026-49400: Deserialization of Untrusted Data

October System provides the system module for October Content Management System. Prior to versions 3.7.17 and 4.2.21, the backend SessionMaker trait stored widget session state as base64serialize... and consumed it with unserialize without an allowedclasses restriction. Any code path that could...

PT-2026-91278

Name of the Vulnerable Software and Affected Versions October CMS versions prior to 3.7.17 October CMS versions prior to 4.2.21 Description The backend SessionMaker trait stores widget session state using base64serialize... and processes it with the unserialize function without an allowed classes...

October System module has an Open Redirect for Administrator Accounts

Impact This advisory affects authenticated administrators who may be redirected to an untrusted URL using the PageFinder schema. The resolver for the page finder link schema october:// allowed external links, therefore allowing an open redirect outside the scope of the active host. This...

October System module has a Reflected XSS via X-October-Request-Handler Header

Impact The X-October-Request-Handler Header does not sanitize the AJAX handler name and allows unescaped HTML to be reflected back. There is no impact since this vulnerability cannot be exploited through normal browser interactions. This unescaped value is only detectable when using a proxy...

VulnCheck KEV: CVE-2021-32648

In affected versions of the october/system package an attacker can request an account password reset and then gain access to the account using a specially crafted request...

CVE-2021-32648: Improper Authentication

octobercms in a CMS platform based on the Laravel PHP Framework. In affected versions of the october/system package an attacker can 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...

Octobercms 安全漏洞

Octobercms is a Php-based Cms website builder from the US company Octobercms. A security vulnerability exists in octobercms october, which originates in an affected version of the october/system package, where an attacker can request a reset of an account password and then use a specially crafted...

CVE-2021-29487: Improper Authentication

octobercms in a CMS platform based on the Laravel PHP Framework. In affected versions of the october/system package an attacker can exploit this vulnerability to bypass authentication and takeover of and user account on an October CMS server. The vulnerability is exploitable by unauthenticated...