Incorrect authorization in MikroTik RouterOS - CVE-2026-103903
Published: October 17, 2026
Vulnerability identifier: #VU156090
CSH Severity: Low
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-103903
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to compromise accounts of other users.
The vulnerability exists due to incorrect authorization in the WinBox authentication. A remote authenticated low-privileged user can obtain the authorization policy of a different existing account, including device administrators.
Affected software
MikroTik RouterOS
How to mitigate CVE-2026-103903
Install updates from vendor's website.
MikroTik RouterOS - update to 7.23.8