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CVE-2026-76403— Improper Certificate Validation through HTTP Event Collector Kerberos Authentication in Splunk Connect for Kafka

Quick assessment

Affected
Splunk Splunk Connect for Kafka
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Splunk Connect for Kafka是美国Splunk公司的一款将Kafka数据接入分析平台的连接器。 Splunk Connect for Kafka 2.2.7之前版本存在加密问题漏洞，该漏洞源于Kerberos认证路径在构建HTTP客户端时未应用配置的证书验证选项，可能导致未经身份验证的用户读取或修改从连接器发送的所有相关数据。

CVSS 7.4 · High EPSS 0.19% · P9

Affected Version Matrix 1

VendorProduct Version RangeStatus
Splunk Splunk Connect for Kafka 2.2< 2.2.7 affected
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I. Basic Information for CVE-2026-76403

Vulnerability Information
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Vulnerability Title
Improper Certificate Validation through HTTP Event Collector Kerberos Authentication in Splunk Connect for Kafka
Source: CVE Program / CVE List V5
Vulnerability Description
In Splunk Connect for Kafka versions below 2.2.7, an unauthenticated user positioned in the network path could read or alter all relevant data sent from the connector when Kerberos authentication is used with Hypertext Transfer Protocol (HTTP) Event Collector in Splunk Enterprise. The vulnerability is possible because the Kerberos authentication path does not apply the configured certificate validation options when it builds the HTTP client. For more information see Install Splunk Connect for Kafka (https://help.splunk.com/en/data-management/integrate-data-with-add-ons/splunk-connect-for-kafka/2.2/install/install-splunk-connect-for-kafka), Security configurations for Splunk Connect for Kafka (https://help.splunk.com/en/splunk-enterprise/get-data-in/splunk-connect-for-kafka/2.2/configure/security-configurations-for-splunk-connect-for-kafka), and Set up and use HTTP Event Collector with configuration files (https://help.splunk.com/en/splunk-enterprise/get-data-in/get-started-with-getting-data-in/9.4/get-data-with-http-event-collector/set-up-and-use-http-event-collector-with-configuration-files) in the Splunk documentation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
证书验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Splunk Connect for Kafka 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Splunk Connect for Kafka是美国Splunk公司的一款将Kafka数据接入分析平台的连接器。 Splunk Connect for Kafka 2.2.7之前版本存在加密问题漏洞，该漏洞源于Kerberos认证路径在构建HTTP客户端时未应用配置的证书验证选项，可能导致未经身份验证的用户读取或修改从连接器发送的所有相关数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Splunk Splunk Connect for Kafka 2.2 ~ 2.2.7 -

II. Public POCs for CVE-2026-76403

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III. Intelligence Information for CVE-2026-76403

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Vendor Advisories for CVE-2026-76403 (1)

Same Patch Batch · Splunk · 2026-08-19 · 110 CVEs total

CVE-2026-76311 9.4 CRITICAL Improper Access Control in Embedded Report Dispatch Archives in Splunk Enterprise
CVE-2026-76310 9.4 CRITICAL Improper Access Control through Embedded Report REST API Requests in Splunk Enterprise
CVE-2026-76312 9.4 CRITICAL Improper Access Control through Embedded Reports in Splunk Enterprise
CVE-2026-76404 9.1 CRITICAL Remote Code Execution (RCE) through Deserialization of Untrusted Data in Splunk MCP Server
CVE-2026-76335 8.8 HIGH Remote Code Execution (RCE) through Splunk Web Manager Configuration in Splunk Enterprise
CVE-2026-76395 8.8 HIGH Remote Code Execution (RCE) through Deserialization of Untrusted Data in the Model Loading
CVE-2026-76316 8.8 HIGH Stored SPL Injection through Deployment Server Broker Registration in Splunk Enterprise
CVE-2026-76253 8.8 HIGH Privilege Escalation through Scheduled Search Alert Action Configuration in Splunk Enterpr
CVE-2026-76352 8.8 HIGH Improper Authorization through the REST API in Splunk Enterprise
CVE-2026-76315 8.8 HIGH Code Injection through Splunk Web Manager Configuration in Splunk Enterprise
CVE-2026-76319 8.8 HIGH Remote Code Execution (RCE) through Federated Search in Splunk Enterprise
CVE-2026-76313 8.8 HIGH Remote Code Execution (RCE) through the REST API in Splunk Enterprise
CVE-2026-76351 8.8 HIGH Server-Side Request Forgery (SSRF) through the Report Notification REST API in Splunk Secu
CVE-2026-76317 8.8 HIGH Path Traversal through the Lookup Configuration REST API in Splunk Enterprise
CVE-2026-76389 8.8 HIGH Server-Side Request Forgery (SSRF) through the REST API in Cisco Talos Intelligence for En
CVE-2026-76259 8.8 HIGH Improper Privilege Management on the Management Port in Splunk Enterprise for Windows
CVE-2026-76350 8.8 HIGH Improper Privilege Management through PDF Attachments for Email Alert Actions in Splunk En
CVE-2026-76314 8.8 HIGH Remote Code Execution (RCE) through Splunk Web Manager Configuration in Splunk Enterprise
CVE-2026-76394 8.3 HIGH Missing Authorization in Container and Connection Management through the REST API in Splun
CVE-2026-76391 8.3 HIGH Improper Privilege Management through Agent Run History in Splunk AI Toolkit

Showing top 20 of 110 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Splunk Connect for Kafka
Same vendor: Splunk
Same weakness: CWE-295

V. Comments for CVE-2026-76403

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