CVE-2026-67276
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)
- Published Sep 5, 2026
- CVSS 9.2 critical
- 6.5% chance of exploitation in the next 30 days (EPSS)
- Public exploit code is available
- A fix is available
Affected software
In the news
- CISA warns of critical pre-auth RCE flaw in MikroTik RouterOS BleepingComputer ·
- MikroTrick Chain Let Attackers Take Over MikroTik Routers Without a Password or SSH Key The Hacker News ·
- Multiple Vulnerabilities in Mikrotik Routers Could Allow for Admin Hijacking CIS MS-ISAC ·
- Mikrotik security advisory (AV26-887) – Update 2 Canadian Centre for Cyber Security ·