Apache Kafka up to 4.2.1/4.3.1 Configuration Provider information disclosure

Summaryinfo

A vulnerability was found in Apache Kafka up to 4.2.1/4.3.1 and classified as problematic. This vulnerability affects unknown code of the component Configuration Provider. Executing a manipulation can lead to information disclosure. This vulnerability appears as CVE-2026-116593. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Apache Kafka up to 4.2.1/4.3.1. This vulnerability affects an unknown code of the component Configuration Provider. The manipulation with an unknown input leads to a information disclosure vulnerability. The CWE definition for the vulnerability is CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. As an impact it is known to affect confidentiality. CVE summarizes:

Apache Kafka Connect has the /connector-plugins/{connector-type}/config/validate endpoint on its REST API to validate connector configurations. Apache Kafka Connect also support Configuration Providers which enable to hide the values of sensitive configuration and only resolve them at runtime.  An attacker with access to the validate endpoint can use it to resolve and return plaintext values via any of the configuration providers installed on a Connect worker. Users are recommended to upgrade to version 4.2.2, 4.3.2, 4.4.0 or above, which fix this issue.

The advisory is shared for download at kafka.apache.org. This vulnerability was named CVE-2026-116593 since 10/26/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/28/2026). The MITRE ATT&CK project declares the attack technique as T1592.

Upgrading to version 4.2.2 or 4.3.2 eliminates this vulnerability.

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Productinfo

Vendor

• Apache

Name

• Kafka

Version

• 4.2.0
• 4.2.1
• 4.3.0
• 4.3.1

License

• open-source

Website

• Vendor: https://www.apache.org/

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