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CVE-2026-67276

8.1 · HIGH

RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking the key type and modulus but omitting the exponent.

Published Sep 5, 2026mikrotikCWE-347EPSS 8.94%

Overview

CVE-2026-67276 is a high-severity vulnerability affecting mikrotik routeros. It was published on September 5, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

RouterOS does not compare the complete RSA public key when matching an SSH authentication request to an authorized user key, checking the key type and modulus but omitting the exponent. Because signature verification uses the client-supplied key, an attacker knowing an authorized RSA modulus can supply a key with exponent one, forge a valid signature, and open an SSH command channel as the target user without the private key.This issue affects only 7.x branch was fixed in versions: 7.23.4 (Long-term) and 7.24.2 (Stable)

Remediation

Check the references section for vendor advisories and patches from mikrotik. Update routeros to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
mikrotikrouteros>= 7.9, < 7.23.4Affected

References

Refcert.pl/en/posts/2026/09/mikrotik-routeros-cveRefcert.pl/en/posts/2026/09/vulnerabilities-in-mikrotik-routeros-actively-exploited/Refforum.mikrotik.com/t/7-23-4-long-term-is-released/272801Refforum.mikrotik.com/t/7-24-2-stable-is-released/272800Refmikrotik.com/supportsec/september-2026-vulnerability/Refnpratley.net/reversing-mikrotiks-silent-patch-the-routeros-7-23-4-fix-they-wouldnt-explain/

How CyberStrike helps

Frequently asked questions

What is CVE-2026-67276?

CVE-2026-67276 is a high-severity vulnerability affecting mikrotik routeros. It was published on September 5, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-67276?

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-67276?

Check the references section for vendor advisories and patches from mikrotik. Update routeros to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-67276?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-67276 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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