CVE-2026-67276 — SSH user impersonation possible in Mikrotik RouterOS
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 e…
Published: 2026-09-05 · CVSS: 9.2 · CVSS 4.0
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)
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7