What’s Vulnerable › Vulnerabilities

CVE-2026-86060: MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-09-10
• EPSS: 6.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-09-05 · updated 2026-09-11
• Weakness: CWE-88

Description

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: from 6.0 before 6.49.21; from 7.0 before 7.23.4; from 7.24 before 7.24.2 — fixed in 6.49.21, 7.23.4, 7.24.2

How to fix

Upgrade to a fixed version: MikroTik RouterOS 6.49.21, 7.23.4, 7.24.2. Check the vendor advisory for mitigations.

References

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

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