{"schemaVersion":3,"id":"CVE-2022-23131","aliases":[],"status":"published","duplicateOf":null,"title":"Zabbix Frontend Authentication Bypass Vulnerability","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).","dates":{"published":"2022-01-13T15:50:39.137Z","modified":"2025-10-21T23:15:49.275Z","reserved":null,"kevAdded":["2022-02-22T00:00:00.000Z"],"kevDue":["2022-03-08T00:00:00.000Z"]},"cvss":{"headline":{"score":9.8,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.1,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.8,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"2.0","versionLabel":"v2.0","source":"NVD","score":5.1,"severity":"medium","vector":"AV:N/AC:H/Au:N/C:P/I:P/A:P","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.95683,"percentile":0.99873,"severity":"critical","asOf":"2026-10-20T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-20T00:00:00.000Z","baselineScore":0.95683},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.95683,"percentile":0.99873}],"last30":[{"date":"2026-09-20T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.95683,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.95683,"percentile":0.99873}]},"kev":{"state":"listed","entries":[{"source":"cisa","sourceLabel":"CISA","dateAdded":"2022-02-22T00:00:00.000Z","dueDate":"2022-03-08T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Zabbix Frontend Authentication Bypass Vulnerability","description":"Unsafe client-side session storage leading to authentication bypass/instance takeover via Zabbix Frontend with configured SAML.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2022-23131","label":"nvd.nist.gov/vuln/detail/CVE-2022-23131"}],"vendor":"Zabbix","product":"Frontend","ransomware":false,"ransomwareUse":"Unknown","exploitationType":null}],"listedCount":1,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":true,"entry":{"source":"cisa","sourceLabel":"CISA","dateAdded":"2022-02-22T00:00:00.000Z","dueDate":"2022-03-08T00:00:00.000Z","requiredAction":"Apply updates per vendor instructions.","name":"Zabbix Frontend Authentication Bypass Vulnerability","description":"Unsafe client-side session storage leading to authentication bypass/instance takeover via Zabbix Frontend with configured SAML.","notes":[{"type":"url","href":"https://nvd.nist.gov/vuln/detail/CVE-2022-23131","label":"nvd.nist.gov/vuln/detail/CVE-2022-23131"}],"vendor":"Zabbix","product":"Frontend","ransomware":false,"ransomwareUse":"Unknown","exploitationType":null}},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-290","name":"Authentication Bypass by Spoofing","description":"This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.","type":"weakness","status":"Incomplete","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/290.html"}],"affected":[{"vendor":"zabbix","product":"frontend","name":"Frontend","label":"frontend","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"5.4.0 - 5.4.8","noFixRecorded":false,"fixedIn":null}],"versionsText":"5.4.0 - 5.4.8","eol":null,"hubHref":"/vendor/zabbix/frontend"},{"vendor":"zabbix","product":"zabbix","name":"zabbix","label":"zabbix","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 5.4.0, ≤ 5.4.8","noFixRecorded":false,"fixedIn":null},{"text":"6.0.0:alpha1","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 5.4.0, ≤ 5.4.8 | 6.0.0:alpha1","eol":{"isEol":false,"eolDate":"2027-02-28T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"6.0","label":"6.0 (LTS)","eolFrom":"2027-02-28T00:00:00.000Z","isLts":true,"isMaintained":true,"latestVersion":"6.0.49"},"product":{"name":"zabbix","label":"Zabbix","category":"server-app"}},"hubHref":"/vendor/zabbix/zabbix"}],"affectedCount":2,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://support.zabbix.com/browse/ZBX-20350","label":"support.zabbix.com/browse/ZBX-20350","hostname":"support.zabbix.com","tags":["X Refsource MISC","Issue Tracking","Patch","Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-23131","label":"www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-23131","hostname":"www.cisa.gov","tags":["Government Resource","US Government Resource"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2022-01-13T15:50:39.137Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"kev-added","date":"2022-02-22T00:00:00.000Z","label":"Added to CISA KEV","detail":"Zabbix Frontend Authentication Bypass Vulnerability","source":"cisa"},{"kind":"kev-due","date":"2022-03-08T00:00:00.000Z","label":"CISA remediation due","detail":"Apply updates per vendor instructions.","source":"cisa"},{"kind":"modified","date":"2025-10-21T23:15:49.275Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":85,"level":"critical","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T16:19:04.576Z","stale":false,"partial":false}}