Attack Chain

1. An attacker identifies a vulnerable Kafka UI instance running a version prior to 0.7.3.
2. The attacker crafts a malicious HTTP request targeting the /api/smartfilters/testexecutions endpoint.
3. Within the crafted request, the attacker injects malicious code into the validateAccess function parameters.
4. The Kafka UI application processes the request without proper sanitization of the injected code.
5. The injected code is executed within the context of the application server.
6. The attacker gains the ability to execute arbitrary commands on the server.
7. The attacker establishes a persistent connection to the compromised system, potentially via a reverse shell.
8. The attacker pivots to other systems or resources within the network, potentially leading to data exfiltration or other malicious activities.

Impact

Successful exploitation of CVE-2026-5562 can lead to arbitrary code execution on the server hosting the Provectus Kafka UI. This could allow attackers to gain complete control of the affected system, potentially leading to data breaches, service disruption, or further lateral movement within the network. Due to the public availability of a reported exploit, organizations running vulnerable versions of Kafka UI are at increased risk of attack. The lack of vendor response also raises concerns about future patches or mitigations.

Recommendation

• Upgrade Provectus Kafka UI to a version greater than 0.7.2 to remediate CVE-2026-5562.
• Implement input validation and sanitization on the /api/smartfilters/testexecutions endpoint to prevent code injection attacks.
• Deploy the Sigma rule Detect Kafka UI Code Injection Attempt to identify potential exploitation attempts targeting CVE-2026-5562.
• Monitor web server logs for suspicious POST requests to /api/smartfilters/testexecutions containing potentially malicious code.