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Vulnerability in KGS Software tia Viewer software
27 October 2026 | CERT Polska | #vulnerability, #warning, #cve
CVE ID CVE-2026-105987
Publication date 27 October 2026
Vendor KGS Software
Product tia Viewer
Vulnerable versions All before 1.2.8
Vulnerability type (CWE) Improper neutralization of input during web page generation ('cross-site scripting') (CWE-79)
Report source Report to CERT Polska

Description

CERT Polska has received a report about vulnerability in KGS Software tia Viewer software and participated in coordination of its disclosure.

The vulnerability CVE-2026-105987: KGS Software tia Viewer is vulnerable to Stored XSS via the annotation API. Due to the lack of input validation, an authenticated attacker can inject arbitrary JavaScript payload into a stickynote annotation. When any user opens the document, the viewer renders the annotation and the browser executes the payload. This may lead to compromising the user's session.

This issue has been fixed in version 1.2.8.

Credits

We thank Dawid Dudek (4c1d8urn) for the responsible vulnerability report.

More about the coordinated vulnerability disclosure process at CERT Polska can be found at https://cert.pl/en/cvd/.