MSRXCVE-2026-86060
CVE-2026-86060
SSH session privilege manipulation via a crafted username in Mikrotik RouterOS
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.
CVSS 4.0 · CNA
chance of exploitation in the next 30 days (EPSS; higher than 93% of CVEs)
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)
Affected products
- Mikrotik RouterOS: 7.24 to < 7.24.2; 7.0.0 to < 7.23.4; 6.0.0 to < 6.49.21
Weakness: CWE-88
7 references (advisories, patches, write-ups)
- 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/ · technical-description
- https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/ · exploit
- https://mikrotik.com/supportsec/september-2026-vulnerability/ · vendor-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
Sources: CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.