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CVE-2026-86060: CWE-88 Improper neutralization of argument delimiters in a command ('argument injection') in Mikrotik RouterOS

0
Critical
VulnerabilityCVE-2026-86060cvecve-2026-86060cwe-88
Published: 09/05/2026 (09/05/2026, 20:00:59 UTC)
Source: CVE Database V5
Vendor/Project: Mikrotik
Product: RouterOS

Description

RouterOS contains an argument-handling flaw in the SSH login path involving usernames that begin with a prohibited character, allowing for the trusted RouterOS policy mask to be changed, leading to privilege escalation. Exploitation requires an unauthenticated SSH session to reach the RouterOS login helper.This issue was fixed in versions: 6.49.21 (Lont-term), 7.23.4 (Lont-term) and 7.24.2 (Stable)

CVSS v4.0

Score 9.2critical

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Vuln. Confidentiality
High
Vuln. Integrity
High
Vuln. Availability
High
Subsq. Confidentiality
None
Subsq. Integrity
None
Subsq. Availability
None
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Affected software

Affected versions
=7.24=7.0.0=6.0.0

Technical Details

Data Version
5.2
Assigner Short Name
CERT-PL
Date Reserved
2026-09-04T19:32:24.461Z
Cvss Version
4.0
State
PUBLISHED
Remediation Level
null

Threat ID: 6a9c76bdacd9273b49572671

Added to database: 09/05/2026, 20:08:29 UTC

Last updated: 09/05/2026, 20:08:29 UTC

Views: 1

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