MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability
This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run RouterOS, fix it now.
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.
US federal civilian agencies must remediate by Sep 13, 2026.
No official fix confirmed yet
Until a fix ships, follow the vendor's mitigations and CISA's required action, limit exposure of affected systems, and watch this record for a patch.
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)
Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.
| Product | Vendor | Affected versions | Fixed in | Source |
|---|---|---|---|---|
| RouterOS | MikroTik | >= 6.0, < 6.49.21; >= 7.0, < 7.23.4; >= 7.24, < 7.24.2 | 6.49.21; 7.23.4; 7.24.2 | NVD |
Sources: NVD = NIST National Vulnerability Database.
Developments from the last 30 days, newest first.
CVE-2026-86060 scored CVSS 9.2
Basis: NIST National Vulnerability Database
CVE-2026-86060 added to CISA KEV: MikroTik RouterOS, MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability
CISA lists this as exploited in the wild. Unpatched RouterOS systems are exposed to active attacks now.
Basis: CISA Known Exploited Vulnerabilities catalog
CISA lists this as exploited in the wild. Unpatched RouterOS systems are exposed to active attacks now.
Treat this as an emergency.
