XSS in Zabbix

CVE-2026-23926

An authenticated (non-super) administrator can create a maintenance period with a JavaScript payload that is executed by any user that opens tooltip for that maintenance period in the Host navigator widget. This can allow the attacker to perform unauthorized actions depending on which user opens the tooltip.

Vulnerability class: XSS (Cross-Site Scripting)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.003 (16.3th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 16th percentile — 16.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-23926: held from 0.003 to 0.003.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000

Affected products

  • Zabbix — versions 7.0.0, 7.4.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-23926?
CVE-2026-23926 is a medium-severity vulnerability in Zabbix, classified under Cross-site Scripting. CVSS score: 6.8/10. Published 2026-05-06.
How severe is CVE-2026-23926?
Medium severity. CVSS v3 base score is 6.8 out of 10.