CVE-2026-23926: An authenticated (non-super) administrator can create a maintenance period with a JavaScript payload that is e

Routine

MEDIUM 6.8UPGRADE

CVE-2026-23926 is a medium-severity flaw (CVSS 6.8) affecting zabbix. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	Required
EPSS exploit chance	0.3% (top 82%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-05-06
Last modified	2026-09-18

Publisher (CNA): Zabbix · Vendor: zabbix

Last updated 2026-09-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-06 08:16 UTCPublished CVE record published
2026-09-18 15:35 UTCUpdated Record last modified

zabbix zabbix UPGRADE

Affected: >= 7.0.0 and < 7.0.24 · >= 7.4.0 and < 7.4.8

Fixed in: 7.0.24, 7.4.8

Safe to downgrade to: a release before 7.0.0

1. Check installed version

apt-cache policy zabbix || rpm -q zabbix || zabbix --version

2. UPGRADE to 7.0.24 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade zabbix

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zabbix

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 7.0.0 (Debian / Ubuntu)

apt-cache madison zabbix sudo apt install zabbix=<VERSION_BEFORE_7.0.0> sudo apt-mark hold zabbix

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list zabbix sudo dnf downgrade zabbix-<VERSION_BEFORE_7.0.0> sudo dnf versionlock add zabbix

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-23926?

zabbix: upgrade to 7.0.24, 7.4.8. Exact commands for each OS are on this page.

Is CVE-2026-23926 being exploited?

CVE-2026-23926 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-23926 affect?

CVE-2026-23926 affects zabbix. Severity is medium (CVSS 6.8). 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 pe

How urgent is CVE-2026-23926?

Priority 28/100. No elevated risk signals yet.

Software pages

Zabbix vulnerabilities

Related CVEs

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CVE-2026-23928 MEDIUM 6.8 UPGRADE The Item history widget (in Zabbix 7.0+) or the Plain text widget (in Zabbix 6.0) can execute injected JavaScr

References

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