Cross-site scripting in Juniper Junos Space - CVE-2026-21904
Published: May 8, 2026
Vulnerability identifier: #VU130695
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-21904
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute commands with the target user's permissions.
The vulnerability exists due to cross-site scripting in the ilpFilter field on nLegacy.jsp when handling user-supplied input in the list filter field. A remote attacker can inject script tags to execute commands with the target user's permissions.
Affected software
Juniper Junos Space
How to mitigate CVE-2026-21904
Install security update from vendor's website.
Juniper Junos Space - update to 24.1R5 Patch V3