Improper access control in Monobank payment API - CVE-2026-84918
Published: September 3, 2026
Vulnerability identifier: #VU146853
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-84918
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.
The vulnerability exists due to the affected module does not verify the Monobank webhook signature before processing payment status callbacks. A remote attacker can bypass payment verification and manipulate payment status callbacks.
Affected software
Monobank payment API
How to mitigate CVE-2026-84918
Install updates from vendor's website.
Monobank payment API - update to 1.0.3