CVE-2026-101986: CWE-287 Improper Authentication in Juniper Networks Junos OS
Description
An Improper Authentication vulnerability in J-Web of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated network attacker to bypass J-Web authentication and execute CGI content with elevated privileges via a crafted HTTP request.
CVSS v3.1
Score 9.8critical
Affected software
Juniper Networks
Junos OS
Juniper Networks
Junos OS Evolved
pkg:rpm/juniper/junos-ospkg:rpm/juniper/junos-os-evoRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-101986) in Juniper Networks Junos OS and Junos OS Evolved's J-Web interface allows an unauthenticated attacker to bypass authentication mechanisms and execute CGI content with elevated privileges through a specially crafted HTTP request. The flaw is categorized under CWE-287 (Improper Authentication) and affects a broad range of versions across multiple release trains, including both standard and evolved versions. The CVSS 3.1 base score is 9.8, reflecting network attack vector, low attack complexity, no privileges required, no user interaction, and high impact on confidentiality, integrity, and availability.
Potential Impact
An unauthenticated attacker can bypass J-Web authentication and execute commands with elevated privileges, potentially leading to full compromise of the affected device. The impact includes complete loss of confidentiality, integrity, and availability of the system through the J-Web interface.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict network access to the J-Web interface to trusted administrators only and monitor for suspicious HTTP requests targeting the J-Web interface.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- juniper
- Date Reserved
- 2026-09-28T16:31:35.504Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acfaf322cdf04f65694d343
Added to database: 10/14/2026, 16:34:58 UTC
Last enriched: 10/14/2026, 18:48:29 UTC
Last updated: 10/15/2026, 04:19:15 UTC
Views: 12
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.