CVE-2026-86060

MikroTik RouterOS: Improper Neutralization of Argument Delimiters in a Command

As of , CVE-2026-86060 in MikroTik RouterOS is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch now.

Exploited
Yes: CISA listed it on 10 September 2026
US federal deadline
13 September 20263 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
Forensic triage
Required by CISA under BOD 26-04Agencies must also look for signs that attackers already got in.
EPSS score
0.06Higher than 93% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
Public exploit
1 Exploit-DB entry
Fix
Vendor advice: mikrotik.comLinks below, from CISA's entry.

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 evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CISA's required action

What the flaw is

MikroTik RouterOS contains an improper neutralization of argument delimiters in a command vulnerability which allows an attacker to change the trusted RouterOS policy mask, leading to privilege escalation.

CISA's 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)

The CVE record's description, from CERT-PL

CVE published
5 September 2026
Assigned by
CERT-PL
CVSS
9.2 Critical (CVSS 4.0, from the CNA)
CWE-88
Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')
CISA SSVC, exploitation
active
CISA SSVC, automatable
yes
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. The US federal deadline to fix it.
  4. CISA changed its entry. Edited: description.
  5. CISA changed its entry. Edited: notes.
  6. Exploit-DB published an exploit (EDB-ID 52683).

Public exploits

Facts from Metasploit's module list and Exploit-DB's index; we never copy exploit code.

RouterOS: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2026-67279Improper Enforcement of Behavioral WorkflowMikroTik RouterOSPatch nowListed in the last 14 days0.01
CVE-2018-14847Router OS Directory TraversalMikroTik RouterOSPatch this weekMetasploit module; EPSS 0.960.96
CVE-2018-7445Stack-Based Buffer OverflowMikroTik RouterOSPatch this weekEPSS 0.610.61
CVE-2026-67277Missing Authentication for Critical FunctionMikroTik RouterOSPatch soon0.02

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