{"id":"ALPINE-CVE-2021-27927","details":"In Zabbix from 4.0.x before 4.0.28rc1, 5.0.0alpha1 before 5.0.10rc1, 5.2.x before 5.2.6rc1, and 5.4.0alpha1 before 5.4.0beta2, the CControllerAuthenticationUpdate controller lacks a CSRF protection mechanism. The code inside this controller calls diableSIDValidation inside the init() method. An attacker doesn't have to know Zabbix user login credentials, but has to know the correct Zabbix URL and contact information of an existing user with sufficient privileges.","modified":"2026-11-03T06:32:27.740173961Z","published":"2021-03-03T17:15:12.753Z","upstream":["CVE-2021-27927"],"references":[{"type":"ADVISORY","url":"https://security.alpinelinux.org/vuln/CVE-2021-27927"}],"affected":[{"package":{"name":"zabbix","ecosystem":"Alpine:v3.12","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.0.9-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.13","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.14","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.15","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.16","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.17","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.18","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.19","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.20","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.21","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.22","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.23","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}},{"package":{"name":"zabbix","ecosystem":"Alpine:v3.24","purl":"pkg:apk/alpine/zabbix?arch=source"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.0.0"},{"fixed":"5.2.6-r0"}]}],"ecosystem_specific":{},"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/alpine/ALPINE-CVE-2021-27927.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}