An incorrect authorization vulnerability in the WinBox
authentication flow of MikroTik RouterOS allows a remote authenticated attacker
with credentials for a low-privilege account permitted to use WinBox to obtain
the authorization policy of a different existing account. The stage-one EC-SRP
challenge and proof are verified using the attacker's account, while the
independently supplied stage-two username is used to install the target
account's privileges. By specifying a higher-privilege account such as admin, a
low-privilege user can obtain a full administrative session without knowing the
target account's password and can use that session to increase the privileges
of the attacker's own account.
Metrics
Affected Vendors & Products
References
History
Tue, 13 Oct 2026 12:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
Mon, 12 Oct 2026 12:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mikrotik
Mikrotik routeros |
|
| Vendors & Products |
Mikrotik
Mikrotik routeros |
Mon, 12 Oct 2026 11:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | An incorrect authorization vulnerability in the WinBox authentication flow of MikroTik RouterOS allows a remote authenticated attacker with credentials for a low-privilege account permitted to use WinBox to obtain the authorization policy of a different existing account. The stage-one EC-SRP challenge and proof are verified using the attacker's account, while the independently supplied stage-two username is used to install the target account's privileges. By specifying a higher-privilege account such as admin, a low-privilege user can obtain a full administrative session without knowing the target account's password and can use that session to increase the privileges of the attacker's own account. | |
| Title | MikroTik RouterOS WinBox split-principal authentication bypass allows privilege escalation | |
| Weaknesses | CWE-863 | |
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: ENISA
Published: 2026-10-12T10:37:23.578Z
Updated: 2026-10-13T11:57:50.805Z
Reserved: 2026-10-01T14:12:50.876Z
Link: CVE-2026-103903
Updated: 2026-10-13T11:52:14.071Z
Status : Awaiting Analysis
Published: 2026-10-12T11:17:09.517
Modified: 2026-10-16T17:25:57.940
Link: CVE-2026-103903
No data.