PT-2026-39660 · Azure · Kafka-Sink-Azure-Kusto

Published 2026-05-11 · Updated 2026-05-11 · CVE-2026-42316

Mitre

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N

kafka-sink-azure-kusto Kafka Connect plugin is the official Microsoft sink for Azure Data Explorer (Kusto). Prior to 5.2.3, kafka-sink-azure-kusto did not sanitize user-controlled values inside the kusto.tables.topics.mapping configuration. The db, table, mapping, and format fields of each mapping entry were interpolated directly into KQL management/query commands via String.formatted(...) (e.g., FETCH TABLE COMMAND.formatted(table) → "

| count", FETCH TABLE MAPPING COMMAND.formatted(table, format, mapping) → ".show table ingestion mapping ''"). An actor able to influence the connector configuration (for example, someone with permissions to submit or edit Kafka Connect connector configs) could embed KQL metacharacters (;, |, ') to execute arbitrary management commands in the context of the connector's service principal — enabling schema enumeration/modification, ingestion-mapping tampering, or changes to streaming/retention policies on the target Azure Data Explorer database. This is a tampering vulnerability. Exploitation requires privileged access to the connector configuration; no end-user interaction or Kafka record payload is involved. This vulnerability is fixed in 5.2.3.

Fix

Weakness Enumeration

CWE-943

Related Identifiers

CVE-2026-42316

Affected Products

Kafka-Sink-Azure-Kusto

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-42316 · Security Note
• https://github.com/Azure/kafka-sink-azure-kusto/releases/tag/v5.2.3 · Note
• https://github.com/Azure/kafka-sink-azure-kusto/pull/155 · Note
• https://github.com/Azure/kafka-sink-azure-kusto/security/advisories/GHSA-c9mr-mqvh-6wgj · Note