How severe is CVE-2026-23926?

CVE-2026-23926 has a CVSS 4.0 base score of 7.3, rated high severity.

Is CVE-2026-23926 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-23926?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-23926 have an EU (EUVD) identifier?

Yes. CVE-2026-23926 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27527.

When was CVE-2026-23926 published?

CVE-2026-23926 was published on 2026-05-06 and last updated on 2026-06-17.

CVE-2026-23926

CVE-2026-23926 is a high-severity vulnerability with a CVSS 4.0 base score of 7.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 4.0 base score 7.3)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27527
Weakness: CWE-79
Published: 2026-05-06
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-23926?: CVE-2026-23926 has a CVSS 4.0 base score of 7.3, rated high severity.
Is CVE-2026-23926 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-23926?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-23926 have an EU (EUVD) identifier?: Yes. CVE-2026-23926 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27527.
When was CVE-2026-23926 published?: CVE-2026-23926 was published on 2026-05-06 and last updated on 2026-06-17.

References

https://support.zabbix.com/browse/ZBX-27758

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