What’s Vulnerable › Vulnerabilities
CVE-2026-101956: Junos OS: Unauthorized root command execution when J-Web is enabled
- Severity: critical (CVSS 9.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-14 · updated 2026-10-15
- Weakness: CWE-287
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.
Affected products
- Juniper Junos OS: from 25.2 before 25.2R2-S2; from 25.4 before 25.4R1-S3; from 26.2 before 26.2R1-S2 — fixed in 25.2R2-S2, 25.4R1-S3, 26.2R1-S2
How to fix
Upgrade to a fixed version: Juniper Junos OS 25.2R2-S2, 25.4R1-S3, 26.2R1-S2. Check the vendor advisory for mitigations.
References
Get alerted when CVE-2026-101956 or the next vulnerability affects your stack