What’s Vulnerable › Vulnerabilities

CVE-2026-19061: Insta InstaKNXServiceApp Firmware Update CreateWebClientAndDownloadFileList data authenticity

• Severity: low (CVSS 3.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-06 · updated 2026-10-13
• Weakness: CWE-345

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".

Affected products

• InstaKNXServiceApp: 1.2.3.1469

References

• https://gist.github.com/isZzzz/f9da7d76cf2f7b93ec3f90efe17ed323
• https://vuldb.com/cve/CVE-2026-19061
• https://vuldb.com/submit/864343
• https://vuldb.com/vuln/386531
• https://vuldb.com/vuln/386531/cti

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