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CVE-2026-21904

MEDIUMCVSS 6.1/10EPSS 0.21%

Last modified

CVE-2026-21904 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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.. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS 4.0
5.1/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability
0.21%

11.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
JuniperJunos Space1.0—
JuniperJunos Space1.1—
JuniperJunos Space1.2—
JuniperJunos Space1.3—
JuniperJunos Space1.4—
JuniperJunos Space2.0—
JuniperJunos Space11.1—
JuniperJunos Space11.2—
JuniperJunos Space11.3—
JuniperJunos Space11.4—
JuniperJunos Space12.1—
JuniperJunos Space12.2—
JuniperJunos Space12.3—
JuniperJunos Space13.1—
JuniperJunos Space13.3R1
JuniperJunos Space14.1—
JuniperJunos Space15.1—
JuniperJunos Space15.2—
JuniperJunos Space16.1—
JuniperJunos Space16.1r3—
JuniperJunos Space17.1—
JuniperJunos Space17.2—
JuniperJunos Space18.1—
JuniperJunos Space18.1r1—
JuniperJunos Space18.2—
JuniperJunos Space18.3—
JuniperJunos Space18.4—
JuniperJunos Space19.1—
JuniperJunos Space20.3R1
JuniperJunos Space21.1R1
JuniperJunos Space21.2R1
JuniperJunos Space21.3R1
JuniperJunos Space22.1R1
JuniperJunos Space22.2R1
JuniperJunos Space22.3R1
JuniperJunos Space23.1R1
JuniperJunos Space24.1R1

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-21904?
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.
How severe is CVE-2026-21904?
CVE-2026-21904 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-21904?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST