CVE-2026-102031: Junos OS Evolved: A low-privileged TACACS+ user causes root command execution when authorization refresh is enabled

Published Oct 14, 2026

Updated

An OS Command Injection vulnerability in TACACS of Juniper Networks Junos OS Evolved allows a low-privileged TACACS+-authenticated user to execute commands with root privileges when periodic TACACS+ authorization-refresh is enabled.

Affected Software

1 affected component

Juniper Networks Junos OS Evolved

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 23.2R2-S7.7-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 23.4R2-S8.11-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 24.2R2-S5.6-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 24.4R2-S5-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 25.2R2-S2-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 25.2X100-D35-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 25.4R1-S3-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 25.4R2-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 25.4X300-D40-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 26.2R1-S2-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 26.2R2-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in 26.4R1-EVO
Upgrade
Upgrade Juniper Networks Junos OS Evolved to a version that resolves this vulnerability.
Fixed in all subsequent releases

Event History

Oct 14, 2026

CVE Published

via MITRE·04:49 PM

Data Sourced

via MITRE·04:49 PM

RemedyDescriptionSeverityWeakness

Frequently Asked Questions

Who can exploit this vulnerability?

A low-privileged user authenticated through TACACS+ can exploit it. The issue affects Juniper Networks Junos OS Evolved when periodic TACACS+ authorization refresh is enabled.

Is TACACS+ authorization refresh required for exploitation?

Yes. The described privilege escalation occurs when periodic TACACS+ authorization-refresh is enabled.

What level of access can an attacker gain?

An attacker can execute operating-system commands with root privileges, resulting in high impact to confidentiality, integrity, and availability.