by Kastro
Paper/Archive/CVE-2026-86060

CVE-2026-86060

Mikrotik RouterOS — SSH session privilege manipulation via a crafted username in Mikrotik RouterOS

KEV · due 13 SepEPSS 6%public exploitSSVC actCVSS 9.2
critical.is priorityof 100
96
CVSS 9.2 (CNA)9.2 / 10 × 3027.6In CISA KEV+3030.0EPSS percentile 93.7.937 × 2018.7Exploit: SSVC active+1010.0SSVC exploitation: active+1010.0
Description · from the CVE record

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

ProductAffectedFixed inSource
RouterOS7.24 – < 7.24.27.24.2CNA
RouterOS7.0.0 – < 7.23.47.23.4CNA
RouterOS6.0.0 – < 6.49.216.49.21CNA

Scores by source

CERT-PL (CNA)9.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: active · Automatable: yes · Technical impact: total

References

writeupcert.pl/en/posts/2026/09/mikrotik-routeros-cvewriteupcert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploitedexploitnpratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explainadvisorymikrotik.com/supportsec/september-2026-vulnerabilityrefforum.mikrotik.com/t/6-49-21-long-term-is-released/272802refforum.mikrotik.com/t/7-23-4-long-term-is-released/272801refforum.mikrotik.com/t/7-24-2-stable-is-released/272800refcisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-86060kevcisa.gov/known-exploited-vulnerabilities-catalog