Paper/Archive/CVE-2026-101956

CVE-2026-101956

Juniper Networks Junos OS — Junos OS: Unauthorized root command execution when J-Web is enabled

CVSS 9.8 (CNA)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 EPSS percentile 54.9.549 × 2011.0 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

Junos OS25.2 – < 25.2R2-S225.2R2-S2CNA

Junos OS25.4 – < 25.4R1-S325.4R1-S3CNA

Junos OS26.2 – < 26.2R1-S226.2R1-S2CNA

Scores by source

juniper (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

juniper (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorysupportportal.juniper.net/JSA112188