CVE-2022-23131: Zabbix Frontend Authentication Bypass Vulnerability
- Is it exploited?
Yes. CISA added it to the Known Exploited Vulnerabilities catalog on , 40 days after the CVE record was published.
- How likely is exploitation in the next 30 days?
- 95.7%
EPSS score, percentile 99.9 of all scored records
- How severe?
- 9.1 Critical
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA deadline . Apply updates per vendor instructions.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- 5.4.0 - 5.4.8
Unaffected 5.4.9
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
What to do
Required action, set by CISA
Apply updates per vendor instructions.
CISA due date for this action: .
Solution (from the CVE record)
To remediate this vulnerability, install the updates or if an immediate update is not possible, follow the presented workarounds.
Workaround (from the CVE record)
Disable SAML authentication
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
Linked from CISA's catalog entry
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | 5.4.0 - 5.4.8 |
| Unaffected | 5.4.9 |
Versions the record lists as unaffected: 5.4.9.
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
About this vulnerability
Unsafe client-side session storage leading to authentication bypass/instance takeover via Zabbix Frontend with configured SAML.
Summary: CISA's KEV catalog, as of .
- CISA added CVE-2022-23131 to its Known Exploited Vulnerabilities (KEV) catalog on 22 Feb 2022.
- CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
- The due date CISA sets for the required action is 8 Mar 2022.
- The CVE record was published on 13 Jan 2022, 40 days before it was added to KEV.
- The CVE record carries a CVSS v3.1 base score of 9.1 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 95.7% (percentile 99.9), as of 28 Oct 2026.
- CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.
Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of ; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of ; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of . About the data.
Description
Unsafe client-side session storage leading to authentication bypass/instance takeover via Zabbix Frontend with configured SAML
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).
Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of . About the data.
Weakness
- CWE-290: Authentication Bypass by Spoofing
CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| Added to CISA KEV | |
| CISA due date for the required action | |
| CVE record last updated |
References
More exploited Zabbix vulnerabilities
- CVE-2022-23134: Zabbix Frontend Improper Access Control Vulnerability