Race condition in Zabbix - CVE-2026-1199
Published: August 18, 2026
Vulnerability identifier: #VU144183
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-1199
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform more password guesses than intended.
The vulnerability exists due to a race condition in the login lockout mechanism in the frontend and api when processing simultaneous unsuccessful login requests. A remote attacker can send multiple concurrent login requests to perform more password guesses than intended.
Affected software
Zabbix
How to mitigate CVE-2026-1199
Install security update from vendor's website.
Zabbix - addressed in versions 6.0.47, 7.0.28, 7.4.12