CVE-2026-23927: A user able to connect to Agent 2 can inject an Oracle TNS connection string via the 'service' parameter

Routine

MEDIUM 6.5UPGRADE

CVE-2026-23927 is a medium-severity flaw (CVSS 6.5) affecting zabbix. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A user able to connect to Agent 2 can inject an Oracle TNS connection string via the 'service' parameter. This can lead to Agent 2 connecting to an attacker-controlled server and leaking Oracle database credentials if they are saved in a named session.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 87%)
CISA exploited list	No
Weakness	CWE-522
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 15:26 UTCUpdated Record last modified

zabbix zabbix UPGRADE

Affected: >= 6.0.0 and < 6.0.45 · >= 7.0.0 and < 7.0.24 · >= 7.4.0 and < 7.4.8

Fixed in: 6.0.45, 7.0.24, 7.4.8

Safe to downgrade to: a release before 6.0.0

1. Check installed version

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

2. UPGRADE to 6.0.45 (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 6.0.0 (Debian / Ubuntu)

apt-cache madison zabbix sudo apt install zabbix=<VERSION_BEFORE_6.0.0> 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_6.0.0> 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-2026-23927?

zabbix: upgrade to 6.0.45, 7.0.24, 7.4.8. Exact commands for each OS are on this page.

Is CVE-2026-23927 being exploited?

CVE-2026-23927 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-2026-23927 affect?

CVE-2026-23927 affects zabbix. Severity is medium (CVSS 6.5). A user able to connect to Agent 2 can inject an Oracle TNS connection string via the 'service' parameter. This can lead to Agent 2 connecting to an attacker-controlled server and leaking Oracle database credentials if they are saved in a na

How urgent is CVE-2026-23927?

Priority 26/100. No elevated risk signals yet.

Software pages

Oracle Database vulnerabilities · Zabbix vulnerabilities

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References

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