---
id: CVE-2026-90453
title: >-
  A file-upload handler redirects the authenticated client's browser to a URL
  taken directly from that same request's Referer header, without validating it
  against the application's own origin
summary: >-
  A file-upload handler redirects the authenticated client's browser to a URL
  taken directly from that same request's Referer header, without validating it
  against the application's own origin. This allows an authenticated attacker to
  craf…
severity: medium
cvss: 5.1
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-601
vendor: CISA
product: Malcolm
affected:
  - Malcolm < v26.06.0
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T19:40:31.053'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90453'
references:
  - url: >-
      https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-254-01.json
    label: ics-cert@hq.dhs.gov
tags:
  - nvd
  - cve.org
epss: 0.00381
epssPercentile: 0.29395
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T12:54:30.614277Z'
cvssSource: cna
ingestedAt: '2026-09-14T15:23:07.429Z'
---

## Overview

A file-upload handler redirects the authenticated client's browser to a URL taken directly from that same request's Referer header, without validating it against the application's own origin. This allows an authenticated attacker to craft a request that causes another user's browser to be redirected to an arbitrary external destination after completing an upload.

## Remediation

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