CVE-2022-23131 — Zabbix Frontend Authentication Bypass Vulnerability

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 g

01What is this vulnerability?

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…

02Affected products

Vendor	Product	Versions
Zabbix	Frontend	5.4.0 - 5.4.8, 5.4.9

03Active exploitation status

Yes — actively exploited. Added to the CISA KEV catalog on 2022-02-22. Ransomware use: Unknown.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

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07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-01-13T15:50:39.137Z
• Last modified: 2025-10-21T23:15:49.275Z
• Added to CISA KEV: 2022-02-22
• BOD 22-01 due: 2022-03-08

09References

• support.zabbix.com — https://support.zabbix.com/browse/ZBX-20350