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CVE-2026-21904— Junos Space: ilpFilter field on nLegacy.jsp is vulnerable to reflected cross-site script injection

Quick assessment

Affected
Juniper Networks Junos Space
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Juniper Networks Junos Space是美国瞻博网络（Juniper Networks）公司的一套网络管理解决方案。该方案支持在设备和服务的整个生命周期内对其进行自动配置、监控和故障排除。 Juniper Networks Junos Space 24.1R5 Patch V3之前版本存在跨站脚本漏洞，该漏洞源于列表过滤器字段输入中和不当，可能导致跨站脚本攻击，使攻击者能够以目标用户权限执行命令。

CVSS 6.1 · Medium EPSS 0.21% · P10
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I. Basic Information for CVE-2026-21904

Vulnerability Information
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Vulnerability Title
Junos Space: ilpFilter field on nLegacy.jsp is vulnerable to reflected cross-site script injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Juniper Networks Junos Space 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Juniper Networks Junos Space是美国瞻博网络（Juniper Networks）公司的一套网络管理解决方案。该方案支持在设备和服务的整个生命周期内对其进行自动配置、监控和故障排除。 Juniper Networks Junos Space 24.1R5 Patch V3之前版本存在跨站脚本漏洞，该漏洞源于列表过滤器字段输入中和不当，可能导致跨站脚本攻击，使攻击者能够以目标用户权限执行命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Juniper Networks Junos Space 0 ~ 24.1R5 Patch V3 -

II. Public POCs for CVE-2026-21904

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III. Intelligence Information for CVE-2026-21904

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Same Patch Batch · Juniper Networks · 2026-04-09 · 26 CVEs total

CVE-2026-33784 9.8 CRITICAL JSI Virtual Lightweight Collector: Default password is not required to be changed which al
CVE-2026-33785 8.8 HIGH Junos OS: MX Series: Missing Authorization for specific 'request' CLI commands in a JDM/CS
CVE-2025-13914 8.7 HIGH Apstra: SSH host key validation vulnerability for managed devices
CVE-2026-33793 7.8 HIGH Junos OS and Junos OS Evolved: When an unsigned Python op script configuration is present,
CVE-2026-33788 7.8 HIGH Junos OS Evolved: Local, authenticated attacker can gain privileged access to FPCs
CVE-2026-33790 7.5 HIGH Junos OS: SRX Series: In a NAT64 configuration, receipt of a specific, malformed ICMPv6 pa
CVE-2026-33778 7.5 HIGH Junos OS: SRX Series, MX Series: When a specifically malformed first ISAKMP packet is rece
CVE-2026-33771 7.4 HIGH CTP OS: Configuring password requirements does not work which permits the use of weak pass
CVE-2026-33797 7.4 HIGH Junos OS and Junos OS Evolved: An attacker sending a specific genuine BGP packet causes a
CVE-2026-21916 7.3 HIGH Junos OS: A low privileged user can escalate their privileges so that they can login as ro
CVE-2026-33791 6.7 MEDIUM Junos OS and Junos OS Evolved: Execution of crafted CLI commands allows for arbitrary shel
CVE-2026-21915 6.7 MEDIUM JSI Virtual Lightweight Collector: Shell escape allows privilege escalation to root
CVE-2026-33780 6.5 MEDIUM Junos OS and Junos OS Evolved: In an EVPN-MPLS scenario churn of ESI routes causes a memor
CVE-2025-59969 6.5 MEDIUM Junos OS Evolved: QFX5000 Series and PTX Series: An attacker sending crafted multicast pac
CVE-2026-21919 6.5 MEDIUM Junos OS and Junos OS Evolved: A high frequency of connecting and disconnecting NETCONF se
CVE-2026-33781 6.5 MEDIUM Junos OS: EX Series, QFX Series: In a VXLAN scenario when specific control protocol packet
CVE-2026-33782 6.5 MEDIUM Junos OS: MX Series: In specific DHCPv6 scenarios jdhcpd memory increases continuously wit
CVE-2026-33775 6.5 MEDIUM Junos OS: MX Series: Mismatch between configured and received packet types causes memory l
CVE-2026-33779 6.5 MEDIUM Junos OS: SRX Series: Insufficient certificate verification for device to SD cloud communi
CVE-2026-33783 6.5 MEDIUM Junos OS Evolved: PTX Series: If SRTE tunnels provisioned via PCEP are present and specifi

Showing top 20 of 26 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Junos Space
Same vendor: Juniper Networks
Same weakness: CWE-79

V. Comments for CVE-2026-21904

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