CVE-2022-23131: Zabbix Frontend Authentication Bypass Vulnerability

Vulnerability summary

CVE-2022-23131 is a critical (CVSS 9.8) Authentication Bypass by Spoofing vulnerability in Zabbix Frontend. It is known to be exploited: CISA lists it, first on 22-02-2022. EPSS estimates a 95.68% chance of exploitation in the next 30 days, higher than 99.8% of scored vulnerabilities.

Timeline

1. 13-01-2022
   PublishedVulnerability first disclosed.
2. 22-02-2022
   Added to CISA KEVZabbix Frontend Authentication Bypass Vulnerability
3. 08-03-2022
   CISA remediation dueApply updates per vendor instructions.
4. 21-10-2025
   Last modifiedVulnerability information updated.

Description

In the case of instances where the SAML SSO authentication is enabled (non-default), session data can be modified by a malicious actor, because a user login stored in the session was not verified. Malicious unauthenticated actor may exploit this issue to escalate privileges and gain admin access to Zabbix Frontend. To perform the attack, SAML authentication is required to be enabled and the actor has to know the username of Zabbix user (or use the guest account, which is disabled by default).

• CWE-290Authentication Bypass by SpoofingThis attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.