Catalog analysis: CISA added this entry on September 25, 2026. The entry reflects catalog information retrieved on September 25, 2026, not a snapshot archived on the inclusion date. This site’s publication date is shown separately. Check current vendor guidance before acting.
What the vulnerability is
CVE-2026-67279 is an improper enforcement of behavioral workflow vulnerability (CWE-841) affecting MikroTik RouterOS. This flaw allows an unauthenticated client to open a session channel and send an exec request. Notably, this vulnerability can be chained with CVE-2026-86060 to achieve unauthenticated exploitation.
Exposure and applicability
This vulnerability is particularly relevant for healthcare providers, health plans, and business associates that utilize MikroTik hardware for network routing, switching, or perimeter security. In a clinical environment, the compromise of core networking infrastructure could lead to unauthorized access to segments containing electronic Protected Health Information (ePHI) or cause disruptions to the continuity of patient care systems.
CISA has added this vulnerability to its Known Exploited Vulnerabilities (KEV) catalog as of September 25, 2026, indicating that it is being actively exploited in the wild. Organizations should evaluate whether their RouterOS assets are exposed to the internet or positioned in critical internal junctions.
Remediation priorities
Based on our analysis, healthcare security leaders and network administrators should prioritize the following actions:
- Immediate Patching: Apply vendor-supplied mitigations for RouterOS as specified by MikroTik. This is the primary method to prevent the initial opening of unauthenticated session channels.
- Exposure Assessment: Identify all MikroTik devices across the clinical and administrative network. Prioritize updates for any device with a public-facing IP address, as these represent the highest risk of external exploitation.
- Vulnerability Chaining Review: Because CVE-2026-67279 can be chained with CVE-2026-86060, administrators should ensure that mitigations for both vulnerabilities are applied to reduce the likelihood of a full unauthenticated compromise.
How to validate remediation
To verify that exposure has been reduced, network teams should:
* Version Verification: Confirm that the installed RouterOS version matches the vendor’s recommended secure release. While a version check does not guarantee total security, it confirms the application of known fixes.
* Configuration Audit: Review access control lists (ACLs) and firewall rules to ensure that management interfaces for routing hardware are not unnecessarily exposed to the public internet or untrusted internal VLANs.
Limits and open questions
Applying updates could reduce the likelihood of exploitation, but it may not eliminate all residual risks associated with network architecture. It remains unknown whether this vulnerability has been utilized in specific ransomware campaigns targeting the healthcare sector. Additionally, while CISA provided a federal agency deadline of September 28, 2026, private healthcare entities must determine their own patching cadence based on their internal risk management profiles and HIPAA Security Rule obligations.
Source and editorial note
CVE-2026-67279: Mikrotik RouterOS Improper Enforcement of Behavioral Workflow Vulnerability · Source date: September 25, 2026 · Retrieved September 25, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
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