CVE-2026-102031 PUBLISHED

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

Assigner: juniper
Reserved: 28.09.2026 Published: 14.10.2026 Updated: 14.10.2026

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.

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 9.8

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: 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/AU:Y/R:A/V:C/RE:M
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	Low
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Juniper Networks
Product	Junos OS Evolved
Versions	Default: unaffected affected from 0 to 23.2R2-S7.7-EVO (excl.) affected from 23.4 to 23.4R2-S8.11-EVO (excl.) affected from 24.2 to 24.2R2-S5.6-EVO (excl.) affected from 24.4 to 24.4R2-S5-EVO (excl.) affected from 25.2 to 25.2R2-S2-EVO (excl.) affected from 25.4 to 25.4R1-S3-EVO (excl.) affected from 26.2 to 26.2R1-S2-EVO (excl.) Version 23.4X100 is affected affected from 25.2X100 to 25.2X100-D35-EVO (excl.) affected from 25.4X300 to 25.4X300-D40-EVO (excl.)

Affected Configurations

[ system tacplus-options authorization-time-interval ]

Exploits

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

Workarounds

There are no known workarounds for this issue.

Solutions

The following software releases have been updated to resolve this specific issue:

Junos OS Evolved: 23.2R2-S7.7-EVO, 23.4R2-S8.11-EVO, 24.2R2-S5.6-EVO, 24.4R2-S5-EVO, 25.2R2-S2-EVO, 25.2X100-D35-EVO, 25.4R1-S3-EVO, 25.4R2-EVO, 25.4X300-D40-EVO, 26.2R1-S2-EVO, 26.2R2-EVO, 26.4R1-EVO, and all subsequent releases.

Note: For Junos OS Evolved releases 23.2-EVO, 23.4-EVO, and 24.2-EVO, specific respins have been referenced. Previously published versions of these releases have been rebuilt to resolve the security vulnerabilities identified in this advisory.

References

https://supportportal.juniper.net/JSA112250

Problem Types

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') CWE