CVE-2026-86060

CRITICAL

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 v3.1 Score

9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Published: 9/5/2026Modified: 9/11/2026

Related Intelligence (0)

No articles currently reference this CVE.

References (8)

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