CVE-2026-23927Network attack vector

Credential theft via injected Oracle TNS service

Published May 6, 2026 · Updated May 6, 2026

TNS injection in the Oracle plugin for Zabbix Agent 2 allows remote authenticated users to steal saved Oracle database credentials. The plugin accepts a crafted TNS connection string in the service parameter and consequently connects Agent 2 to an attacker-controlled Oracle listener. The attack requires access to Agent 2 and a named Oracle session with stored credentials; the resulting exposure is limited to those credentials and connection integrity.

CVSS severity5.1
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TNS injection in the Oracle plugin for Zabbix Agent 2 allows remote authenticated users to steal saved Oracle database credentials. The plugin accepts a crafted TNS connection string in the service parameter and consequently connects Agent 2 to an attacker-controlled Oracle listener. The attack requires access to Agent 2 and a named Oracle session with stored credentials; the resulting exposure is limited to those credentials and connection integrity.

The record

CVE
CVE-2026-23927
Published
May 6, 2026
Updated
May 6, 2026
Vendor
Zabbix
Product
Zabbix
Classifications
CWE-522, T1552
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.0.0 <=6.0.44 changes=[{"at":"6.0.45","status":"unaffected"}]
  2. Affected versionversion=7.0.0 <=7.0.23 changes=[{"at":"7.0.24","status":"unaffected"}]
  3. Affected versionversion=7.4.0 <=7.4.7 changes=[{"at":"7.4.8","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zabbix · Zabbixversion=6.0.0 <=6.0.44 changes=[{"at":"6.0.45","status":"unaffected"}]; version=7.0.0 <=7.0.23 changes=[{"at":"7.0.24","status":"unaffected"}]; version=7.4.0 <=7.4.7 changes=[{"at":"7.4.8","status":"unaffected"}]

Published CVSS scores

5.1ZabbixCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:H/SI:H/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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