Junos Space <=24.1R5 Patch V3 XSS via List Filter
CVE-2026-21904 Published on April 9, 2026
Junos Space: ilpFilter field on nLegacy.jsp is vulnerable to reflected cross-site script injection
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.
Vulnerability Analysis
CVE-2026-21904 is exploitable with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2026-21904 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2026-21904
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Affected Versions
Juniper Networks Junos Space:- Before 24.1R5 Patch V3 is affected.