---
id: CVE-2026-21904
title: >-
  An Improper Neutralization of Input During Web Page Generation ('Cross-site
  Scripting') vulnerability in Juniper Networks Junos Space allows an attacker
  to inject script tags in the 


  list filter field that, when visited by another user,…
summary: >-
  An Improper Neutralization of Input During Web Page Generation ('Cross-site
  Scripting') vulnerability in Juniper Networks Junos Space allows an attacker
  to inject script tags in the 


  list filter field that, when visited by another user,…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
vendor: juniper
product: junos_space
affected:
  - junos_space = 1.0
  - junos_space = 1.1
  - junos_space = 1.2
  - junos_space = 1.3
  - junos_space = 1.4
  - junos_space = 2.0
  - junos_space = 11.1
  - junos_space = 11.2
  - junos_space = 11.3
  - junos_space = 11.4
  - junos_space = 12.1
  - junos_space = 12.2
  - junos_space = 12.3
  - junos_space = 13.1
  - junos_space = 13.3
  - junos_space = 14.1
  - junos_space = 15.1
  - junos_space = 15.2
  - junos_space = 16.1
  - junos_space = 16.1r3
  - junos_space = 17.1
  - junos_space = 17.2
  - junos_space = 18.1
  - junos_space = 18.1r1
  - junos_space = 18.2
  - junos_space = 18.3
  - junos_space = 18.4
  - junos_space = 19.1
  - junos_space = 20.3
  - junos_space = 21.1
  - junos_space = 21.2
  - junos_space = 21.3
  - junos_space = 22.1
  - junos_space = 22.2
  - junos_space = 22.3
  - junos_space = 23.1
  - junos_space = 24.1
published: '2026-04-09'
updated: '2026-07-08'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-21904'
references:
  - url: 'https://kb.juniper.net/JSA106003'
    label: sirt@juniper.net
tags:
  - nvd
epss: 0.0021
epssPercentile: 0.10053
ingestedAt: '2026-07-08T03:46:38.622Z'
---

## Overview

An Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Juniper Networks Junos Space allows an attacker to inject script tags in the 

list filter field that, when visited by another user, enables the attacker to execute commands with the target's permissions, including an administrator.

This issue affects all versions of Junos Space before 24.1R5 Patch V3.

## Affected

- `junos_space = 1.0`
- `junos_space = 1.1`
- `junos_space = 1.2`
- `junos_space = 1.3`
- `junos_space = 1.4`
- `junos_space = 2.0`
- `junos_space = 11.1`
- `junos_space = 11.2`
- `junos_space = 11.3`
- `junos_space = 11.4`
- `junos_space = 12.1`
- `junos_space = 12.2`
- `junos_space = 12.3`
- `junos_space = 13.1`
- `junos_space = 13.3`
- `junos_space = 14.1`
- `junos_space = 15.1`
- `junos_space = 15.2`
- `junos_space = 16.1`
- `junos_space = 16.1r3`
- `junos_space = 17.1`
- `junos_space = 17.2`
- `junos_space = 18.1`
- `junos_space = 18.1r1`
- `junos_space = 18.2`
- `junos_space = 18.3`
- `junos_space = 18.4`
- `junos_space = 19.1`
- `junos_space = 20.3`
- `junos_space = 21.1`
- `junos_space = 21.2`
- `junos_space = 21.3`
- `junos_space = 22.1`
- `junos_space = 22.2`
- `junos_space = 22.3`
- `junos_space = 23.1`
- `junos_space = 24.1`

## Remediation

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