CVE-2026-25133
MediumCVSS 4.8Exploitation Probability (EPSS)
Low risk12th percentile - higher than 12% of all known CVEs
Summary
October CMS versions prior to 3.7.14 and 4.1.10 contain a stored cross-site scripting vulnerability in the SVG sanitization logic. The regex pattern used to strip event handler attributes could be bypassed using a crafted payload, allowing malicious SVG files to be uploaded through the Media Manager with embedded JavaScript. Exploitation could lead to privilege escalation if a superuser views or embeds the malicious SVG, and requires authenticated backend access with media upload permissions.
Risk Assessment
Attackers can execute arbitrary scripts in the context of a superuser's browser, potentially leading to session theft, content modification, or further privilege escalation.
Recommendation
Update October CMS to version 3.7.14 or 4.1.10 and restrict media upload 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. Versions prior to 3.7.14 and 4.1.10 contain a stored cross-site scripting (XSS) vulnerability in the SVG sanitization logic. The regex pattern used to strip event handler attributes (such as onclick or onload) could be bypassed using a crafted payload that exploits how the pattern matches attribute boundaries, allowing malicious SVG files to be uploaded through the Media Manager with embedded JavaScript. Exploitation could lead to privilege escalation if a superuser views or embeds the malicious SVG, and requires authenticated backend access with media upload permissions. The SVG must be viewed or embedded in a page for the payload to trigger. This issue has been fixed in versions 3.7.14 and 4.1.10.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS