CVE-2026-76403 Improper Certificate Validation through HTTP Event Collector Kerberos Authentication in Splunk Connect for Kafka
An attacker can read or alter data in transit when Kerberos authentication is used with HTTP Event Collector in Splunk Connect for Kafka.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-76403?
CVE-2026-76403 is a high-severity vulnerability in Splunk Connect for Kafka, published on 19 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-295
Which versions are affected by CVE-2026-76403?
It affects 1 product.
Products include Splunk Connect for Kafka.
How do I fix CVE-2026-76403?
No fix has been published for CVE-2026-76403 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-76403 being exploited?
There is no known exploitation of CVE-2026-76403 in the wild and no public exploit code.
Other vulnerabilities in Splunk Connect for Kafka
Sources
Also known as GHSA-xf48-ph6x-76rj.