CVE-2026-1199 API and Frontend login lockout race condition
Attackers can bypass login lockout mechanisms by sending simultaneous requests, allowing unlimited password guessing attempts against Zabbix accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-1199?
CVE-2026-1199 is a medium-severity vulnerability in Zabbix Zabbix, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Zabbix API and Frontend login lockout mechanism has a flaw where several unsuccessful login requests are not properly counted towards the block counter if sent simultaneously, potentially allowing for more password guesses than intended.
Weakness: CWE-362
Which versions are affected by CVE-2026-1199?
It affects 1 product.
Products include Zabbix Zabbix.
How do I fix CVE-2026-1199?
Apply the vendor's patch.
Is CVE-2026-1199 being exploited?
There is no known exploitation of CVE-2026-1199 in the wild and no public exploit code.
Other vulnerabilities in Zabbix Zabbix
Sources
Also known as DEBIAN-CVE-2026-1199, GHSA-vm66-478p-4mqw, UBUNTU-CVE-2026-1199.