CVE-2026-86060
critical CISA KEVMikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability
Vendor / product: MikroTik — RouterOS
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Required action (CISA)
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.
Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve cvd@cert.pl
- https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ cvd@cert.pl
- https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802 cvd@cert.pl
- https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801 cvd@cert.pl
- https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800 cvd@cert.pl
- https://mikrotik.com/supportsec/september-2026-vulnerability/ cvd@cert.pl
- https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt... cvd@cert.pl
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-86060 134c704f-9b21-4f2e-91b3-4a467353bcc0