CVE-2026-86060

CRITICAL9.8

CISA KEV

Published 2026-09-05 · Updated 2026-09-11 · Source cvd@cert.pl

Summary

CVE-2026-86060 is a critical-severity (CVSS 9.8) vulnerability in MikroTik RouterOS. CISA added it to the Known Exploited Vulnerabilities catalog on September 10, 2026, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by September 13, 2026. CISA does not currently list it as used in ransomware campaigns. MikroTik has 5 vulnerabilities in the KEV catalog, 0 of them linked to ransomware.

All 5 known-exploited MikroTik vulnerabilities →

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)

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-88

CISA Known-Exploited Vulnerability

Product: MikroTik — RouterOS

Name: MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability

Date added: 2026-09-10 · Due: 2026-09-13

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.

References

View on NVD

More exploited MikroTik vulnerabilities

Most recently added to CISA KEV

CVE-2026-67279
RouterOS — Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability
added 2026-09-25
CVE-2026-67277
RouterOS — MikroTik RouterOS Missing Authentication for Critical Function Vulnerability
added 2026-09-10
CVE-2018-7445
RouterOS — MikroTik RouterOS Stack-Based Buffer Overflow Vulnerability
added 2022-09-08
CVE-2018-14847
RouterOS — MikroTik Router OS Directory Traversal Vulnerability
added 2021-12-01

View all →

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