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CVE-2026-101956 is an improper authentication vulnerability in the J-Web web management component of Juniper Networks Junos OS. An unauthenticated remote attacker who can reach an enabled J-Web interface can execute arbitrary Junos commands with root privileges. Affected releases include Junos OS 25.2 before 25.2R2-S2, 25.4 before 25.4R1-S3, and 26.2 before 26.2R1-S2. Junos OS Evolved is not listed as affected by this vulnerability. The vulnerability is rated critical, with CVSS 3.1 and CVSS 4.0 scores of 9.8 and 9.3, respectively.
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A critical improper authentication vulnerability in J-Web allows remote, unauthenticated attackers to execute arbitrary Junos commands as root without user interaction. J-Web must be enabled and reachable. The technical details identify affected Junos OS releases on the 25.2, 25.4, and 26.2 branches; the cited CVE record does not list Junos OS Evolved as affected. This is a separate flaw, not an exploit chain with CVE-2026-101986.
An improper authentication vulnerability in Juniper Networks Junos OS J-Web allows unauthenticated remote attackers to execute arbitrary Junos commands with root privileges through an exposed J-Web interface. The advisory does not specify affected versions, exploitation activity, or remediation.
A critical improper authentication vulnerability in Juniper Networks Junos OS's J-Web management component permits unauthenticated remote attackers to execute arbitrary Junos commands with root privileges when J-Web is enabled and exposed. The content reports CVSS scores of 9.8 under version 3.1 and 9.3 under version 4.0. Specific affected and fixed versions are not provided.
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