---
id: CVE-2026-107333
title: >-
  Malcolm's nginx based reverse proxy contains a URL path normalization
  inconsistency between its Lua based role-based access control (RBAC)
  authorization layer and nginx's own request routing logic
summary: >-
  Malcolm's nginx based reverse proxy contains a URL path normalization
  inconsistency between its Lua based role-based access control (RBAC)
  authorization layer and nginx's own request routing logic. An authenticated
  user can craft a speci…
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-863
vendor: CISA
product: Malcolm
affected:
  - Malcolm <= 26.07.1
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T21:03:43.847'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107333'
references:
  - url: >-
      https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-280-01.json
    label: ics-cert@hq.dhs.gov
  - url: 'https://github.com/cisagov/Malcolm/security/advisories/GHSA-v66f-cwcm-hf73'
    label: ics-cert@hq.dhs.gov
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-08T17:56:11.739Z'
---

## Overview

Malcolm's nginx based reverse proxy contains a URL path normalization inconsistency between its Lua based role-based access control (RBAC) authorization layer and nginx's own request routing logic. An authenticated user can craft a specially formatted request path to bypass role-based restrictions and reach administrative or role gated endpoints they should not have access to. This affects all restricted paths protected by the RBAC authorization layer, including file upload, PHP server, htadmin, and authentication management interfaces.

## Remediation

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