Mikrotik RouterOS up to 6.49.20/7.23.3/7.24.1 SSH Login privileges management

Summaryinfo

A vulnerability was found in Mikrotik RouterOS up to 6.49.20/7.23.3/7.24.1 and classified as very critical. This affects an unknown part of the component SSH Login. Such manipulation leads to privileges management. This vulnerability is listed as CVE-2026-86060. The attack may be performed from remote. In addition, an exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Mikrotik RouterOS up to 6.49.20/7.23.3/7.24.1. Affected by this issue is an unknown code of the component SSH Login. The manipulation with an unknown input leads to a privileges management vulnerability. Using CWE to declare the problem leads to CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)

The advisory is shared for download at cert.pl. This vulnerability is handled as CVE-2026-86060 since 09/04/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are unknown but an exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/16/2026). The MITRE ATT&CK project declares the attack technique as T1068.

It is declared as attacked. This issue was added on 09/10/2026 to the CISA Known Exploited Vulnerabilities Catalog with a due date of 09/13/2026:

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BO

Upgrading to version 6.49.21, 7.23.4 or 7.24.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-72029). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Router Operating System

Vendor

• Mikrotik

Name

• RouterOS

Version

• 6.49.0
• 6.49.1
• 6.49.2
• 6.49.3
• 6.49.4
• 6.49.5
• 6.49.6
• 6.49.7
• 6.49.8
• 6.49.9
• 6.49.10
• 6.49.11
• 6.49.12
• 6.49.13
• 6.49.14
• 6.49.15
• 6.49.16
• 6.49.17
• 6.49.18
• 6.49.19
• 6.49.20
• 7.23.0
• 7.23.1
• 7.23.2
• 7.23.3
• 7.24.0
• 7.24.1

License

• commercial

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CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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