CVE entry · CVE-2026-67279
CVE-2026-67279: Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability
Mikrotik RouterOS contains an improper enforcement of behavioral workflow vulnerability that could allow an unauthenticated client to open a session channel and send an exec request. This vulnerability can be chained to achieve unauthenticated exploitation of CVE-2026-86060.
- Actively exploited: added to CISA’s KEV catalog on September 25, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: September 28, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes MikroTik RouterOS, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.