High SEVERITY — Vulnerability

CVE-2026-23920 — Host and event action script input is validated with a regex (set by the administrator), but the validation runs in mult

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.

Platform
Zabbix
CVE Record
CVE-2026-23920
CVSS Score
7.7/10
Published
24 March 2026
Views
20
Primary source: Review the official advisory at nvd.nist.gov Go to Source

Summary

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.

Assessment

  • CVE: CVE-2026-23920
  • CVSS base score: 7.7
  • Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
  • Source: NVD record

References

Action

  • Verify affected systems against your inventory
  • Apply the vendor patch during a maintenance window
  • Restrict access at the network layer until patched
zabbix *

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