CVE-2026-23927 Zabbix CVE debrief

Who should care

Defenders responsible for Agent 2 and Oracle database security should assess exposure and prioritize verification and restriction of Agent 2 connections. This includes security teams, vulnerability management teams, and operators responsible for maintaining Agent 2 and Oracle database systems. They should review the CVE record and NVD entry for accurate information and plan vendor-supported updates or mitigations where exposure is confirmed.

Why it matters

Defenders should prioritize verifying and restricting Agent 2 connections to prevent potential leakage of Oracle database credentials and connections to attacker-controlled servers.

• Potential leakage of Oracle database credentials
• Possible connection to attacker-controlled servers
• Need for verification and restriction of Agent 2 connections
• Importance of monitoring Agent 2 activity for suspicious connections

Technical summary

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. The vulnerability is a result of insufficient input validation and sanitization in Agent 2, allowing an attacker to inject malicious connection strings. Defenders should prioritize verifying and restricting Agent 2 connections to prevent potential security incidents.

Defensive priority

Defenders should prioritize verifying and restricting Agent 2 connections, especially in environments where Oracle database credentials are used.

Recommended defensive actions

• Verify and restrict Agent 2 connections to trusted servers
• Review and update Oracle database credentials saved in named sessions
• Monitor Agent 2 activity for suspicious connections
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its CVSS score and affected versions. The vulnerability is confirmed to exist in Agent 2, and defenders should verify the presence of affected product deployments in their managed environments. The CVE Program and NVD offer official guidance on the vulnerability, and defenders should review these sources for accurate information.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.