{"id":"CVE-2022-23131","kind":"vulnerability","aliases":["CVE-2022-23131"],"related":[],"title":"Zabbix Frontend: 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).","summary":"Zabbix Frontend trusts client-side session data when SAML single sign-on is configured, so an attacker can forge a session and log in without credentials. A successful bypass lets the attacker take over the Zabbix instance.","severity":"critical","cvss":9.8,"epss":0.95683,"exploited":true,"exploited_at":"2022-02-22T00:00:00+00:00","products":[{"name":"Zabbix Frontend","fixed":[],"affected":"","ecosystem":"vendor"}],"ecosystems":["vendor"],"tags":["exploited","other","saml","self-hosted","zabbix"],"not_affected_if":["default-config","no-saml"],"how_to_check":"Check whether SAML authentication is enabled under Administration > Authentication in the Zabbix web UI.","fix":"Upgrade Zabbix Frontend to a fixed version per vendor instructions; the sources do not name the fixed version.","status":"open","published_at":"2022-01-13T16:15:08+00:00","first_seen_at":"2026-10-23T19:11:52+00:00","triaged_at":"2026-10-23T21:26:31+00:00","updated_at":"2026-10-23T21:57:35+00:00","category":"other","confidence":0.7,"triage":{"at":"2026-10-23T21:26:31Z","model":"claude-haiku-5-5","output":{"fix":"Upgrade Zabbix Frontend to a fixed version per vendor instructions; the sources do not name the fixed version.\nunknown","reach":"internet","impact":"high","summary":"Zabbix Frontend trusts client-side session data when SAML single sign-on is configured, so an attacker can forge a session and log in without credentials. A successful bypass lets the attacker take over the Zabbix instance.","category":"other","who_cares":["zabbix","self-hosted","saml"],"confidence":0.7,"needs_auth":"no","worst_case":"Attacker bypasses login and takes over the Zabbix instance","analyst_note":"Find the affected and fixed Zabbix Frontend version ranges and the vendor advisory from the CISA KEV entry or Zabbix security pages.","how_to_check":"Check whether SAML authentication is enabled under Administration > Authentication in the Zabbix web UI.\nunknown","needs_analyst":true,"not_affected_if":["default-config","no-saml"],"user_interaction":"no","needs_special_setup":"yes","severity_if_unknown":"high"},"cost_usd":0.000474,"input_tokens":2824,"output_tokens":383,"severity_before":"unknown"},"analyst_status":null,"analyst_note":null,"search":"'-2022':9A,12A '-23131':10A,13A 'access':110C 'account':140C 'actor':85C,99C,127C 'admin':109C 'attack':41B,56B,117C 'authent':5A,71C,119C 'bypass':6A,53B 'case':64C 'client':27B 'client-sid':26B 'configur':38B 'credenti':50B 'cve':8A,11A 'data':30B,78C 'default':76C,145C 'disabl':143C 'enabl':73C,124C 'escal':105C 'exploit':16B,101C 'forg':43B 'frontend':2A,4A,15A,24B,113C 'gain':108C 'guest':139C 'host':21B 'instanc':61B,66C 'issu':103C 'know':130C 'let':54B 'log':47B 'login':89C 'malici':84C,97C 'may':100C 'modifi':81C 'non':75C 'non-default':74C 'perform':115C 'privileg':106C 'requir':121C 'saml':18B,32B,69C,118C 'self':20B 'self-host':19B 'session':29B,45B,77C,93C 'side':28B 'sign':35B 'sign-on':34B 'singl':33B 'sso':70C 'store':90C 'success':52B 'take':57B 'trust':25B 'unauthent':98C 'use':137C 'user':88C,135C 'usernam':132C 'verifi':96C 'vulner':7A 'without':49B 'zabbix':1A,3A,14A,22B,23B,60B,112C,134C","nicknames":[],"mitigations":[],"who_affected":null,"tier":null,"verified":{},"analyst_revisit_at":null,"first_public_at":"2022-01-13T16:15:08+00:00","kev":{"dateAdded":"2022-02-22","dueDate":"2022-03-08","requiredAction":"Apply updates per vendor instructions.","knownRansomwareCampaignUse":"Unknown"},"cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cvss_by":"security@zabbix.com","poc_count":0,"sources":[{"source":"kev","external_id":"CVE-2022-23131","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2022-23131","severity":null,"published_at":"2022-02-22T00:00:00+00:00","modified_at":null,"first_seen_at":"2026-10-23T19:11:52+00:00","fetched_at":"2026-10-25T20:35:37+00:00","note":null},{"source":"epss","external_id":"CVE-2022-23131","url":"https://api.first.org/data/v1/epss?cve=CVE-2022-23131","severity":null,"published_at":null,"modified_at":null,"first_seen_at":"2026-10-23T19:13:44+00:00","fetched_at":"2026-10-23T19:13:44+00:00","note":null},{"source":"nvd","external_id":"CVE-2022-23131","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-23131","severity":null,"published_at":"2022-01-13T16:15:08+00:00","modified_at":"2026-06-17T04:29:34+00:00","first_seen_at":"2026-10-23T21:57:35+00:00","fetched_at":"2026-10-23T21:57:35+00:00","note":null}],"documents":[],"notice":"Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai"}