# CVE-2026-116593: Apache Kafka: Kafka Connect configuration provider values exposed via validation REST API endpoint

Status: published. Published: 2026-10-28. Updated: 2026-11-05.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Apache Software Foundation / Apache Kafka (org.apache.kafka:connect-runtime): ≥ 2.4.0; < 4.2.2 (affected, semver); ≥ 4.3.0; < 4.3.2 (affected, semver). Source: CNA: apache

## Severity and prioritization

- CVSS 3.1: 8.1 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N; source: ADP: CISA-ADP

- CISA KEV: No listing in collected sources

- EPSS: 0.23% as of 2026-11-05; percentile 13.47%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-200

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://kafka.apache.org/cve-list (CNA: apache; vendor-advisory)

- https://lists.apache.org/thread/ylblfrfk1bspy9zh2j6dz8o2pkn6s9g0 (CNA: apache; mailing-list)

- http://www.openwall.com/lists/oss-security/2026/10/28/16 (ADP: CVE)

## Provenance

- CNA: apache: https://www.cve.org/CVERecord?id=CVE-2026-116593; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-116593; retrieved 2026-11-05; source updated Not reported

Revision: 3c886440802d3c8f0986dda86f95be4eb80d54526ed9e808f4fb1687917919f9

Canonical: https://y2.dev/cve/CVE-2026-116593

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