# CVE-2026-86060

## Summary

- **CVE ID:** CVE-2026-86060
- **Severity:** CRITICAL
- **CVSS Score:** 9.2 (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)
- **CWE:** CWE-88
- **Published:** Sep 5, 2026
- **Last Modified:** Sep 9, 2026

## 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 (Lont-term), 7.23.4 (Lont-term) and 7.24.2 (Stable)

## Affected Products

- Mikrotik — RouterOS (7.24)
- Mikrotik — RouterOS (7.0.0)
- Mikrotik — RouterOS (6.0.0)

## References

- [CNA](https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve)
- [CNA](https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/)
- [CNA](https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/)
- [CNA](https://mikrotik.com/supportsec/september-2026-vulnerability/)
- [CNA](https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802)
- [CNA](https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801)
- [CNA](https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.40%
- **EPSS Percentile:** 33.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._