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    CVE-2026-23920

    Host and event action script input is validated with a regex (set by the administrator), but the validation runs in multiline mode. If ^ and $ anchors are used in user input validation, an injected newline lets authenticated users bypass the check and inject shell commands.

    Published:Mar 24, 2026
    Last Modified:Mar 26, 2026
    EPS:Mar 24, 2026
    EPSS Score:0.00047
    CVSS Score:7.7

    Affected Products

    Vendor
    Zabbix
    Product
    Zabbix

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-59781 (CVSS 5.4) — When Zabbix Agent was installed on Windows into a custom installation directory, the installer did not verify …
    CVE-2026-23938 (CVSS 2.1) — An authenticated administrator is able to crash Zabbix server or proxy by creating specifically crafted prepro…
    CVE-2026-23937 (CVSS 6) — The Zabbix API host.get action can be exploited by authenticated users to extract a host's PSK key leading to …
    CVE-2026-23935 (CVSS 6.8) — A Zabbix administrator is able to read out of bounds memory by utilizing a flaw in script item/preprocessing (…
    CVE-2026-23934 (CVSS 5.1) — An authenticated user is able to cause disproportionate CPU load on the Frontend webserver by sending specific…
    CVE-2026-23933 (CVSS 7.7) — In Zabbix 7.4 the cryptographic key used for signing Frontend sessions has been erroneously written to the dat…
    CVE-2026-23931 (CVSS 5.3) — The frontend validatate.api.exists action can be exploited by authenticated users to extract plaintext user ma…
    CVE-2026-23930 (CVSS 5.3) — An unauthenticated user is able to cause disproportionate CPU load on the Frontend webserver by sending specif…
    CVE-2026-23929 (CVSS 8.5) — Prototype pollution vulnerability in searchParamsToObject() is leading to a persistent XSS in Maps. URL parame…
    CVE-2026-1199 (CVSS 6.9) — Zabbix API and Frontend login lockout mechanism has a flaw where several unsuccessful login requests are not p…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High