---
id: CVE-2026-25133
title: October is a Content Management System (CMS) and web platform
summary: >-
  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
  att…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: octobercms
product: october
affected:
  - october <= 3.7.13
  - 'october >= 4.0.0, <= 4.1.9'
published: '2026-04-14'
updated: '2026-07-25'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-25133'
references:
  - url: >-
      https://github.com/octobercms/october/security/advisories/GHSA-gcqv-f29m-67gr
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00217
epssPercentile: 0.10716
ingestedAt: '2026-07-26T10:11:59.230Z'
---

## Overview

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.

## Affected

- `october <= 3.7.13`
- `october >= 4.0.0, <= 4.1.9`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.