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CVE-2026-67276 is a RouterOS SSH public-key authentication flaw: the server compared an RSA key’s type and modulus but omitted its public exponent. CERT Polska says attackers could exploit that mismatch to authenticate as a target account without its private key. It was one part—not the whole—of the MikroTrick vulnerability chain. If your MikroTik router’s SSH service was reachable from the public internet, update to a fixed release and investigate its logs and configuration.
What did MikroTik’s SSH key check miss?
In normal RSA public-key authentication, the server should compare the offered public key with the key authorized for the account. CERT Polska says the affected RouterOS check compared the key type and modulus but left out the public exponent. Signature verification then used the key supplied by the SSH client rather than confirming the complete authorized key.
According to CERT Polska’s MikroTrick analysis, someone who knew a target username and its authorized RSA modulus could provide an exponent-one key and forge a signature. That could open an SSH command channel as the target account without possession of the account’s corresponding private key. The flaw is tracked as CVE-2026-67276.
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How CVE-2026-67276 fits into MikroTrick
MikroTrick is CERT Polska’s name for a chain of RouterOS vulnerabilities. The exponent omission concerns SSH public-key authentication, but it should not be mistaken for the entire unauthenticated-takeover chain. CERT describes a separate SSH rekey-state flaw as enabling unauthenticated command execution; the chain also included a crafted-username privilege-manipulation flaw.
| Vulnerability | Role in the incident, as described by CERT Polska |
|---|---|
| CVE-2026-67276 | RSA authorized-key comparison omitted the public exponent, enabling forged authentication as a target account under the described conditions. |
| CVE-2026-86060 | Crafted-username privilege manipulation flaw. |
| CVE-2026-67279 | SSH rekey-state flaw; CERT describes this separate flaw in the chain as enabling unauthenticated command execution. |
CERT Polska confirmed active exploitation against devices whose SSH services were reachable from public networks. The practical exposure question is therefore whether an affected router’s management services were accessible to untrusted networks, not simply whether it used RouterOS.
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Which RouterOS versions contain the fixes?
MikroTik’s security bulletin lists fixes for the September 2026 issues in RouterOS 7.24.3, 7.23.6, and 6.49.21, or later releases on the applicable branch. Check the bulletin and your device’s branch before upgrading, since version numbering and available releases vary by branch.
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What to do if your router may be exposed
1. Restrict access, then upgrade
- From a trusted management connection, restrict SSH, WebFig, and bandwidth-test access so they are not reachable from outside trusted management networks. If you cannot update immediately, disable these services from untrusted networks in the meantime. MikroTik advises: “Make sure SSH and the web interface (WebFig) are not open to any untrusted networks.”
- Upgrade promptly to a fixed release appropriate for your RouterOS branch, using MikroTik’s current security bulletin to confirm the applicable release.
- Until patched, avoid initiating TLS or built-in SSH client connections from the affected device over untrusted paths, as CERT Polska advises.
Restricting exposure is a temporary protective measure, not a substitute for installing the update.
2. Review logs and configuration
After updating, check logs and router configuration for changes you do not recognize. CERT Polska identifies these example log entries as artifacts to investigate:
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login failure for user -2 from <ip> via sshuser <name> added by ssh:-2@<ip>
Also look for an unexplained privileged user named ops, unknown users, scripts, scheduler tasks, proxy servers, tunnels, or other unfamiliar configuration changes. An indicator warrants investigation; it does not by itself establish the full scope or timing of compromise.
3. Treat the Flagged marker as a warning, not a clean bill of health
CERT’s “Flagged” marker checks selected traces. Its presence is a reason to investigate, but its absence does not prove a router is safe. CERT Polska states: “The absence of the marker does not rule out an earlier compromise.”
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4. If you find signs of compromise
CERT Polska recommends isolating a suspected compromised router and preserving logs and configuration before resetting it. Restore from a trusted configuration, then change passwords, keys, and other secrets. Avoid blindly restoring a backup taken from a potentially compromised device, since it may carry unwanted changes forward.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to assess your router’s risk
Use three facts to frame the response: the RouterOS branch and version, whether management services—especially SSH—were reachable from untrusted networks, and whether logs or configuration contain suspicious indicators. Publicly reachable SSH is the exposure condition CERT associated with observed attacks; a suspicious indicator calls for investigation. Neither a version check nor a clean-looking marker alone establishes that a device was never compromised.
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