Vulnerability · Published Oct 14, 2026 · Assigned by juniper
CVE-2026-101956Junos OS: Unauthorized root command execution when J-Web is enabled
Critical 9.8
In plain English
A critical-severity improper authentication in Junos OS from Juniper Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 55% of all known vulnerabilities).
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.8%top 44.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Juniper Networks | Junos OS | 25.2 – before 25.2R2-S225.4 – before 25.4R1-S326.2 – before 26.2R1-S2 |
Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://supportportal.juniper.net/JSA112188 vendor-advisory