9.2
Critical
CVE-2026-86060 MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability
Active exploitation observed
· CISA KEV catalogue
Required action
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 BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Ransomware campaigns
Not observed so far
Weakness
CWE-88
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 (Long-term), 7.23.4 (Long-term) and 7.24.2 (Stable)
Affected products and versions
Other CVEs of RouterOS
The 26 CVEs of RouterOS →
CVE-2026-89035
MikroTik RouterOS through 7.24.5 contains a session token replay vulnerability in the WebFig interface that allows…
9.1
Critical
CVE-2026-112158
A weakness has been identified in MikroTik RouterOS up to 6.40.5/6.44/7.20.8
7.1
High
CVE-2026-103903
An incorrect authorization vulnerability in the WinBox authentication flow of MikroTik RouterOS allows a remote…
8.7
High
CVE-2026-84411
The web management service in affected RouterOS versions contains an integer underflow in its HTTP request body handling…
9.8
Critical