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Known exploited vulnerability

CVE-2026-86060

criticalCVSS 4.0 9.2In CISA KEVEPSS 6.4%Published · Mikrotik

The short answer

CVE-2026-86060 affects Mikrotik RouterOS and is rated critical (CVSS 9.2). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-09-10: attackers are using it, so patch it first.

What it is

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)

Weakness: CWE-88.

Severity

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

Exploited (CISA KEV)

Yes, since Sep 10, 2026

Federal due date Sep 13, 2026

EPSS, next 30 days

6.4%

Higher than 94% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Attack requirements
Present
Privileges required
None
User interaction
None
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…

Affected products

RouterOS. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-86060 being exploited?

Yes. CISA added CVE-2026-86060 to its Known Exploited Vulnerabilities catalog on 2026-09-10, with a federal remediation due date of 2026-09-13.

How do I fix CVE-2026-86060?

CISA's required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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