Argument-handling Flaw in RouterOS by MikroTik
CVE-2026-86060

9.2CRITICAL

Key Information:

Vendor

Mikrotik

Status
Routeros
Vendor
CVE Published:
5 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-86060?

MikroTik's RouterOS is vulnerable due to an argument-handling flaw in the SSH login process, specifically affecting usernames that start with a prohibited character. This flaw allows an attacker to manipulate the trusted RouterOS policy mask, facilitating privilege escalation. The exploitation of this vulnerability requires an unauthorized SSH session targeting the RouterOS login helper, presenting a significant risk to network security. The issue has been rectified in versions 6.49.21 (Long-term), 7.23.4 (Long-term), and 7.24.2 (Stable).

Affected Version(s)

RouterOS 7.24 < 7.24.2

RouterOS 7.0.0 < 7.23.4

RouterOS 6.0.0 < 6.49.21

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-86060 - Proof of Concept

CVE-2026-86060 - Proof of Concept

References

https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve
third-party-advisory
https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikro...
technical-description
https://npratley.net/reversing-mikrotiks-silent-patch-the...
exploit

CVSS V4

Score:
9.2
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sławomir Rozbicki (CERT.PL)
.