CVE-2026-21904: CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') in Juniper Networks Junos Space
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.
AI Analysis
Technical Summary
This vulnerability involves improper neutralization of input during web page generation in Juniper Networks Junos Space, specifically allowing script injection through the list filter field. Successful exploitation enables execution of arbitrary commands with the permissions of the user viewing the injected content, which could include administrators. The issue affects all versions before 24.1R5 Patch V3. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and low impact on confidentiality and integrity, with no impact on availability. No vendor advisory or patch information is currently available.
Potential Impact
An attacker can inject malicious scripts that execute in the context of other users' sessions, potentially leading to unauthorized actions performed with the victim's privileges, including administrative commands. This can compromise confidentiality and integrity of the affected system. There is no indication of availability impact. No known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution with untrusted input in the list filter field and consider limiting access to Junos Space interfaces. Monitor vendor communications for updates on patches or official mitigations.
CVE-2026-21904: CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting') in Juniper Networks Junos Space
Description
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.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves improper neutralization of input during web page generation in Juniper Networks Junos Space, specifically allowing script injection through the list filter field. Successful exploitation enables execution of arbitrary commands with the permissions of the user viewing the injected content, which could include administrators. The issue affects all versions before 24.1R5 Patch V3. The CVSS 3.1 vector indicates network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and low impact on confidentiality and integrity, with no impact on availability. No vendor advisory or patch information is currently available.
Potential Impact
An attacker can inject malicious scripts that execute in the context of other users' sessions, potentially leading to unauthorized actions performed with the victim's privileges, including administrative commands. This can compromise confidentiality and integrity of the affected system. There is no indication of availability impact. No known active exploitation has been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should exercise caution with untrusted input in the list filter field and consider limiting access to Junos Space interfaces. Monitor vendor communications for updates on patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-01-05T17:32:48.709Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69d843721cc7ad14da3fb3f7
Added to database: 4/10/2026, 12:25:22 AM
Last enriched: 4/17/2026, 12:23:53 PM
Last updated: 5/24/2026, 8:59:52 PM
Views: 52
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.