CVE-2026-86060
SSH session privilege manipulation via a crafted username in Mikrotik RouterOS
KEVCRITICAL 9.2EPSS 6.4%
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
- Mikrotik · RouterOS
- CVSS v4.0 CERT
- 9.2 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v3.1 NVD
- 9.8 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS
- 6.39% chance of exploitation in the next 30 days, 94th percentile
- CISA KEV
- added 2026-09-10
- Published
- 2026-09-05
- Updated
- 2026-09-11
Proof-of-concept exploits (5)
- https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldn…
- bahirul/cve-2026-860601★ · 2026-09-10
- digiprosec/MicroTrick55★ · 2026-09-23
- gagaltotal/CVE-2026-mikrotik-poc3★ · 2026-10-08
- HackSpeak/CVE-2026-672794★ · 2026-09-26
ExploitDB entries (1)
Security advisories
- https://mikrotik.com/supportsec/september-2026-vulnerability
- https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve
- https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited
- https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldn…
- 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