CVE-2021-27927
Last modified
CVE-2021-27927 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 1.47% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Zabbix | Zabbix | >= 4.0.0, <= 4.0.27 |
| Zabbix | Zabbix | >= 5.0.0, <= 5.0.9 |
| Zabbix | Zabbix | >= 5.2.0, <= 5.2.3 |
References
- https://support.zabbix.com/browse/ZBX-18942Issue Tracking, Patch, Vendor Advisory
- https://support.zabbix.com/browse/ZBX-18942Issue Tracking, Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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