---
id: CVE-2026-34809
title: >-
  Endian Firewall version 3.3.25 and prior allow stored cross-site scripting
  (XSS) via the remark parameter to /cgi-bin/zonefw.cgi
summary: >-
  Endian Firewall version 3.3.25 and prior allow stored cross-site scripting
  (XSS) via the remark parameter to /cgi-bin/zonefw.cgi. An authenticated
  attacker can inject arbitrary JavaScript that is stored and executed when
  other users view…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: endian
product: firewall_community
affected:
  - firewall_community <= 3.3.25
published: '2026-04-02'
updated: '2026-07-24'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34809'
references:
  - url: 'https://help.endian.com/hc/en-us/sections/360004371358-Community'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/endian-firewall-cgi-bin-zonefw-cgi-remark-stored-cross-site-scripting
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00138
epssPercentile: 0.03568
ingestedAt: '2026-07-25T21:03:58.560Z'
---

## Overview

Endian Firewall version 3.3.25 and prior allow stored cross-site scripting (XSS) via the remark parameter to /cgi-bin/zonefw.cgi. An authenticated attacker can inject arbitrary JavaScript that is stored and executed when other users view the affected page.

## Affected

- `firewall_community <= 3.3.25`

## Remediation

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