KGS tia Viewer 受 Stored XSS 漏洞影響，1.2.8 前版本易被利用
Vulnerability in KGS Software tia Viewer software
KGS Software tia Viewer 於 2026 年 10 月 27 日發現一個 Stored XSS 漏洞，所有 1.2.8 前版本皆易受攻擊。
此漏洞暴露了 KGS tia Viewer 在注釋 API 中的 Stored XSS，允許已授權攻擊者注入任意 JavaScript，當使用者開啟檔案時瀏覽器執行，可能導致會話被劫持。建議立即升級至 1.2.8 以修補此問題並強化輸入驗證。
Vulnerability in KGS Software tia Viewer software
| 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/.