CVE-2026-86060 KEV EXPLOIT
9.8
CRITICAL · CVSS 3.1 · EPSS 6.4% (pctl 94)
Patch first
On CISA KEV — known exploited in the wild, due 2026-09-13.
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)
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 6.39% — more likely to be exploited than 94% of all CVEs |
| Weakness | CWE-88 |
| On CISA KEV | yes — remediate by 2026-09-13 |
| Public exploit | yes |
| Published | 2026-09-05 |
| Last modified | 2026-09-11 |
CISA KEV
| Name | MikroTik RouterOS Improper Neutralization of Argument Delimiters in a Command Vulnerability |
|---|---|
| Added | 2026-09-10 |
| Due | 2026-09-13 |
| Vendor / product | MikroTik / RouterOS |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| mikrotik | routeros |
Public exploits
| Source | Title | Date |
|---|---|---|
| exploit-db | MikroTrick_ 7.24_ 7.24.2_ 7.0.0_ 7.23.4_ 6.0.0_ 6.49.21 - RCE | 2026-09-24 |
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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