---
id: CVE-2026-100909
title: A vulnerability was found in OctoberCMS up to 4.1.19/4.2.25/4.3.4
summary: >-
  A vulnerability was found in OctoberCMS up to 4.1.19/4.2.25/4.3.4. The
  impacted element is the function getSourcePathForResize of the file
  modules/system/classes/ResizeImages.php. The manipulation of the argument
  realSourcePath results i…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-918
product: OctoberCMS
affected:
  - OctoberCMS 4.1.0
  - OctoberCMS 4.1.1
  - OctoberCMS 4.1.2
  - OctoberCMS 4.1.3
  - OctoberCMS 4.1.4
  - OctoberCMS 4.1.5
  - OctoberCMS 4.1.6
  - OctoberCMS 4.1.7
  - OctoberCMS 4.1.8
  - OctoberCMS 4.1.9
  - OctoberCMS 4.1.10
  - OctoberCMS 4.1.11
  - OctoberCMS 4.1.12
  - OctoberCMS 4.1.13
  - OctoberCMS 4.1.14
  - OctoberCMS 4.1.15
  - OctoberCMS 4.1.16
  - OctoberCMS 4.1.17
  - OctoberCMS 4.1.18
  - OctoberCMS 4.1.19
  - OctoberCMS 4.2.0
  - OctoberCMS 4.2.1
  - OctoberCMS 4.2.2
  - OctoberCMS 4.2.3
  - OctoberCMS 4.2.4
  - OctoberCMS 4.2.5
  - OctoberCMS 4.2.6
  - OctoberCMS 4.2.7
  - OctoberCMS 4.2.8
  - OctoberCMS 4.2.9
  - OctoberCMS 4.2.10
  - OctoberCMS 4.2.11
  - OctoberCMS 4.2.12
  - OctoberCMS 4.2.13
  - OctoberCMS 4.2.14
  - OctoberCMS 4.2.15
  - OctoberCMS 4.2.16
  - OctoberCMS 4.2.17
  - OctoberCMS 4.2.18
  - OctoberCMS 4.2.19
  - OctoberCMS 4.2.20
  - OctoberCMS 4.2.21
  - OctoberCMS 4.2.22
  - OctoberCMS 4.2.23
  - OctoberCMS 4.2.24
  - OctoberCMS 4.2.25
  - OctoberCMS 4.3.0
  - OctoberCMS 4.3.1
  - OctoberCMS 4.3.2
  - OctoberCMS 4.3.3
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T05:16:30.067'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100909'
references:
  - url: >-
      https://github.com/0xGenesi/CVE/blob/main/October_CMS_Stream_Wrapper_Injection.md
    label: cna@vuldb.com
  - url: >-
      https://github.com/octobercms/october/commit/0e9736aa2c6d6bd3d60ff6ef9e0b4d32ce387f58
    label: cna@vuldb.com
  - url: 'https://github.com/octobercms/october/releases/tag/v4.3.5'
    label: cna@vuldb.com
  - url: >-
      https://github.com/octobercms/october/security/advisories/GHSA-2xmm-m4wv-3fjh
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-100909'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/919993'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/410869'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/410869/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-28T05:03:24.965Z'
---

## Overview

A vulnerability was found in OctoberCMS up to 4.1.19/4.2.25/4.3.4. The impacted element is the function getSourcePathForResize of the file modules/system/classes/ResizeImages.php. The manipulation of the argument realSourcePath results in server-side request forgery. The attack may be performed from remote. The exploit has been made public and could be used. Upgrading to version 4.3.5 and 4.4.0 is sufficient to resolve this issue. The patch is identified as 0e9736aa2c6d6bd3d60ff6ef9e0b4d32ce387f58. The affected component should be upgraded.

## Remediation

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