CVE-2021-27927

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-03-03 · updated 2026-06-17
Weakness: CWE-352

Description

In Zabbix from 4.0.x before 4.0.28rc1, 5.0.0alpha1 before 5.0.10rc1, 5.2.x before 5.2.6rc1, and 5.4.0alpha1 before 5.4.0beta2, the CControllerAuthenticationUpdate controller lacks a CSRF protection mechanism. The code inside this controller calls diableSIDValidation inside the init() method. An attacker doesn't have to know Zabbix user login credentials, but has to know the correct Zabbix URL and contact information of an existing user with sufficient privileges.

Affected products

Zabbix: from 4.0.0 through 4.0.27; from 5.0.0 through 5.0.9; from 5.2.0 through 5.2.3

References

https://lists.debian.org/debian-lts-announce/2023/04/msg00013.html
https://support.zabbix.com/browse/ZBX-18942
https://lists.debian.org/debian-lts-announce/2023/04/msg00013.html
https://support.zabbix.com/browse/ZBX-18942

Get alerted when CVE-2021-27927 or the next vulnerability affects your stack