Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability (CVE-2026-67279) is being actively exploited, CISA warns
CISA added CVE-2026-67279 (MikroTik RouterOS) to its Known Exploited Vulnerabilities catalog on September 25, 2026, which means there is reliable evidence of exploitation in the wild. 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…
Excerpt from the primary source: CISA Known Exploited Vulnerabilities
Who is affected
Security professionals
Affected technology: RouterOS
Why it matters
CISA lists this as exploited in the wild. Unpatched RouterOS systems are exposed to active attacks now.
Automated: stated only from CISA listings and the exploitation evidence in the sources below.
What you should do · Act now
Treat this as an emergency. Identify every system running RouterOS, apply the vendor's fix or published mitigations immediately, and check for signs of compromise. Patching alone does not remove an attacker who already got in.
CISA's required action for CVE-2026-67279: "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." US federal civilian agencies must comply by September 28, 2026.
Automated guidance based on this story's classification. Check the linked advisories for specifics.
Sources
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