Vulnerability details
CVE-2026-86060
Actively exploited
MikroTik RouterOS
SSH session privilege manipulation via a crafted username in Mikrotik RouterOS
CVSS 4.0
9.2Critical
Official 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)
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.2Critical | 4.0 | CVEProject cvelistV5 (CNA) (CERT-PL) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| MikroTik | RouterOS | 6.0.0 ≤ v < 6.49.21 | CVEProject cvelistV5 (CNA) |
| MikroTik | RouterOS | 7.0.0 ≤ v < 7.23.4 | CVEProject cvelistV5 (CNA) |
| MikroTik | RouterOS | 7.24 ≤ v < 7.24.2 | CVEProject cvelistV5 (CNA) |
References and advisories
8- https://cert.pl/en/posts/2026/09/mikrotik-routeros-cve third-party-advisory
- https://cert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/ technical-description
- https://npratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/ exploit
- https://mikrotik.com/supportsec/september-2026-vulnerability/ vendor-advisory
- https://forum.mikrotik.com/t/6-49-21-long-term-is-released/272802 release-notes
- https://forum.mikrotik.com/t/7-23-4-long-term-is-released/272801 release-notes
- https://forum.mikrotik.com/t/7-24-2-stable-is-released/272800 release-notes
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-86060 government-resource
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Details
- Published
- 2026-09-05
- Last updated
- 2026-09-11
- State
- Published
- Assigner (CNA)
- CERT-PL
- Kolun priority
- 97 · Critical
CISA KEV catalog
- Date added
- 2026-09-10
- Due date
- 2026-09-13
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
6.39%
Probability of exploitation in 30 days
93.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Active
- Technical impact
- Total
Weaknesses (CWE)
- CWE-88Improper neutralization of argument delimiters in a command ('argument injection')