CVE-2026-101956

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Improper Authentication in Juniper Junos OS J-Web

Publication date: 2026-10-14

Last updated on: 2026-10-15

Assigner: Juniper Networks, Inc.

Description

An Improper Authentication vulnerability in the J-Web web management component of Juniper Networks Junos OS allows an unauthenticated remote attacker to execute arbitrary Junos commands with root privileges via the exposed J-Web web interface.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-14

Last Modified

2026-10-15

Generated

2026-10-19

AI Q&A

2026-10-15

EPSS Evaluated

2026-10-18

NVD

CVE-2026-101956

EUVD

EUVD-2026-101440

Affected Vendors & Products

Vendor	Product	Version / Range
Juniper	Networks	Junos OS 25.2
Juniper	Networks	Junos OS 25.4
Juniper	Networks	Junos OS 26.2

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-287	When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Attack-Flow Graph

Executive Summary

This vulnerability is an Improper Authentication issue in Juniper Networks Junos OS. It allows an unauthenticated remote attacker to execute arbitrary Junos commands with root privileges through the exposed J-Web web interface.

Detection Guidance

Detect this vulnerability by checking if the J-Web interface is exposed to untrusted networks. Inspect network traffic for unauthorized access attempts to J-Web ports (typically 80 or 443). Verify if Junos OS versions are affected by reviewing system logs for unusual command executions via J-Web.

Impact Analysis

An attacker could gain full control over the affected system, execute malicious commands, steal data, or disrupt services. This could lead to unauthorized access, data breaches, or system compromise.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR, HIPAA, or other regulations due to unauthorized access, data breaches, or loss of sensitive information. Organizations may face legal penalties, fines, or reputational damage.

Mitigation Strategies

Immediately disable J-Web if not required. Restrict access to J-Web via firewall rules to trusted IPs only. Update Junos OS to the latest patched version. Monitor logs for suspicious activity and consider implementing network segmentation to isolate critical systems.

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