critical Known exploitedREV. 01
CVE-2026-86060MikroTik RouterOS — Remote Login Argument Injection to Privilege Escalation
An unauthenticated attacker who can reach a MikroTik RouterOS device's Secure Shell (SSH) login can send a username starting with a prohibited character to alter the trusted policy mask and gain elevated privileges. Exploited in the wild.
Read the risk
THE VITAL STATS- CVSS score
- 9.8/ 10 CVSS v3.1
- EPSS probability
- 1% Likelihood of exploitation
- Attack complexity
- Low Conditions needed to exploit
- Known exploited
- Yes — CISA KEV
- CVE published
- 2026-09-05
- Added to KEV
- 2026-09-10
- Exploit published
- Yes
- Confidence
- medium
- Kill chain
- initial access
- MITRE ATT&CK
- T1190
- Severity
- critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attacker needsNetwork access to the device's Secure Shell (SSH) login; no account or user interaction needed
Fixed inRouterOS 6.49.21, RouterOS 7.23.4, RouterOS 7.24.2
Behind the card
5 REFERENCES- 01CVE recordNVD recordnvd.nist.gov
- 02CISACISA Known Exploited Vulnerabilities catalogcisa.gov
- 03Vendor advisorycert.plcert.pl
- 04Vendor advisorymikrotik.commikrotik.com
- 05Exploitnpratley.netnpratley.net
Field-level provenanceTRACE THE SOURCES +
Which source supports each field, when it was retrieved, and who extracted it.
| Fields | Source | Retrieved | Extractor | Confidence |
|---|---|---|---|---|
| cvss, exploitation.attack_complexity, exploitation.exploit_available, references, published_at | nvd.nist.gov | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| exploitation.known_exploited, exploitation.kev_added | cisa.gov | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| epss | api.first.org | 2026-09-20 | scrty-crds-pipeline/0.1 | high |
| title, summary, severity, remediation, mitre_attack, kill_chain, recommended_action, confidence, tags, exploitation.prerequisites | nvd.nist.gov | 2026-09-20 | claude-code | high |
| summary, exploitation.prerequisites | nvd.nist.gov | 2026-09-20 | human | high |
Printing history
THE RECORD- r1Initial base card
First printing. This card has not been reprinted since publication.