CVE-2026-19061

Deferred Deferred - Pending Action

Insufficient Data Authenticity Check in Insta InstaKNXServiceApp

Publication date: 2026-08-06

Last updated on: 2026-10-13

Assigner: VulDB

Description

A flaw has been found in Insta InstaKNXServiceApp 1.2.3.1469. Affected by this issue is the function CreateWebClientAndDownloadFileList of the component Firmware Update Handler. Executing a manipulation can lead to insufficient verification of data authenticity. It is possible to launch the attack remotely. Attacks of this nature are highly complex. The exploitation is known to be difficult. There are still doubts about whether this vulnerability truly exists. The vendor explains: "[T]he entry suggests that the device does not verify the authenticity of the update. This is incorrect. The device performs an authenticity check after the complete update has been transferred. If this check fails, the update is not installed and the previously installed firmware continues to run".

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-06

Last Modified

2026-10-13

Generated

2026-10-19

AI Q&A

2026-08-07

EPSS Evaluated

2026-10-18

NVD

CVE-2026-19061

Affected Vendors & Products

Vendor	Product	Version / Range
insta	instaknserviceapp	1.2.3.1469

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-345	The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

Attack-Flow Graph

Executive Summary

This vulnerability is in Insta InstaKNXServiceApp 1.2.3.1469 where the CreateWebClientAndDownloadFileList function in the Firmware Update Handler component fails to properly verify data authenticity. This could allow remote attackers to manipulate firmware updates due to insufficient validation.

Detection Guidance

Detection of CVE-2026-19061 requires monitoring for unusual firmware update activities or unauthorized file downloads from the InstaKNXServiceApp component. Check logs for instances of CreateWebClientAndDownloadFileList function calls with unexpected parameters or sources. Inspect network traffic for connections to untrusted servers during firmware update processes.

Impact Analysis

An attacker could exploit this to push malicious firmware updates to your system remotely. This might lead to unauthorized code execution, data breaches, or system compromise. However, the attack is described as highly complex and difficult to execute.

Compliance Impact

This vulnerability involves insufficient verification of data authenticity in the Firmware Update Handler, which could allow remote manipulation. While not explicitly tied to GDPR or HIPAA, such flaws may violate compliance requirements for data integrity and secure updates, potentially leading to unauthorized firmware changes or data tampering.

Mitigation Strategies

Immediately update or patch the Insta InstaKNXServiceApp to the latest version if available. If no patch exists, consider disabling the Firmware Update Handler component or isolating the affected system from the network to prevent remote exploitation.

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