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CVE-2026-86060

MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability

Mikrotik RouterOS CWE-88

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)

CVSS Score
9.2
Critical
EPSS — Exploit Probability
6.4%
Riskier than 94% of all CVEs · checked 2026-10-21
Exploitation
Confirmed in the wild
KEV since 2026-09-10
Remediation
Patch available
Federal deadline 2026-09-13
CISA 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. Deadline for federal agencies: 2026-09-13.

NVD entry Vendor patch PoC / advisory CISA KEV

8 articles across 5 outlets · first covered Sep 6, 2026 · latest Sep 25, 2026

Coverage timeline

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