Vulnerability details

CVE-2026-101956

Juniper Networks Junos OS

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

CVSS 4.0

9.3Critical

Official 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

Score	Version	Source	Vector
9.3Critical	4.0	CVEProject cvelistV5 (CNA) (juniper)	`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L`
9.8Critical	3.1	CVEProject cvelistV5 (CNA) (juniper)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

Affected products

Vendor	Product	Versions	Source
Juniper Networks	Junos OS	25.2 ≤ v < 25.2R2-S2	CVEProject cvelistV5 (CNA)
Juniper Networks	Junos OS	25.4 ≤ v < 25.4R1-S3	CVEProject cvelistV5 (CNA)
Juniper Networks	Junos OS	26.2 ≤ v < 26.2R1-S2	CVEProject cvelistV5 (CNA)

References and advisories

https://supportportal.juniper.net/JSA112188 vendor-advisory

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Details

Published: 2026-10-14
Last updated: 2026-10-15
State: Published
Assigner (CNA): juniper
Kolun priority: 28 · Low

Exploit prediction (EPSS)

0.75%

Probability of exploitation in 30 days

55.2%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: None
Technical impact: Total

Weaknesses (CWE)

CWE-287
Improper Authentication