CVE-2026-86060

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 v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve	Third Party Advisory
https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/	Mitigation Third Party Advisory
https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802	Release Notes
https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801	Release Notes
https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800	Release Notes
https://mikrotik.com/supportsec/september-2026-vulnerability/	Vendor Advisory
https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/	Exploit Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-86060	US Government Resource

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:mikrotik:routeros::::::::
	cpe:2.3:o:mikrotik:routeros::::::::
	cpe:2.3:o:mikrotik:routeros::::::::

History

No history.

Information

Published : 2026-09-05 20:17

Updated : 2026-09-11 12:52

NVD link : CVE-2026-86060

Mitre link : CVE-2026-86060

CVE.ORG link : CVE-2026-86060

JSON object : View

Products Affected

mikrotik

routeros

CWE

CWE-88

Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')

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Exploitation requires an unauthenticated SSH session to reach the RouterOS login helper.This issue was fixed in versions:\u00a06.49.21 (Long-term),\u00a07.23.4 (Long-term)\u00a0and\u00a07.24.2 (Stable)"}], "lastModified": "2026-09-11T12:52:16.507", "cisaActionDue": "2026-09-13", "cisaExploitAdd": "2026-09-10", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CFC981EC-B44C-40B5-945B-2283FADEC961", "versionEndExcluding": "6.49.21", "versionStartIncluding": "6.0"}, {"criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "881306AB-32B1-4B5F-96D8-9532D25F7AE4", "versionEndExcluding": "7.23.4", "versionStartIncluding": "7.0"}, {"criteria": "cpe:2.3:o:mikrotik:routeros:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A41D6B3C-D321-4C61-B3D5-00F8276CB4AC", "versionEndExcluding": "7.24.2", "versionStartIncluding": "7.24"}], "operator": "OR"}]}], "sourceIdentifier": "cvd@cert.pl", "cisaRequiredAction": "Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA\u2019s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA\u2019s \u201cForensics Triage Requirements\u201d (see URL in Notes). 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