CVE-2026-23927 Agent 2 Oracle plugin TNS connection string injection via the 'service' parameter
Attackers can inject TNS connection strings to force Zabbix to connect to malicious servers, potentially leaking Oracle database credentials.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23927?
CVE-2026-23927 is a medium-severity server-side request forgery vulnerability in Zabbix Zabbix, published on 6 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Weakness: CWE-522
Which versions are affected by CVE-2026-23927?
It affects 1 product.
Products include Zabbix Zabbix.
How do I fix CVE-2026-23927?
Apply the vendor's patch.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-23927 being exploited?
There is no known exploitation of CVE-2026-23927 in the wild and no public exploit code.
Other vulnerabilities in Zabbix Zabbix
Sources
Also known as DEBIAN-CVE-2026-23927, GHSA-r8x9-p5v6-vx46, UBUNTU-CVE-2026-23927.