CVE-2026-105987— Stored XSS in KGS Software tia Viewer

Quick assessment

Affected

KGS Software tia Viewer

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

KGS Software 的 TIA Viewer 存在通过标注 API 触发的存储型跨站脚本（Stored XSS）漏洞。由于缺乏输入验证，已认证的攻击者可将任意 JavaScript 载荷注入到便签（stickynote）标注中。当任何用户打开该文档时，查看器会渲染该标注，导致浏览器执行恶意载荷，进而可能窃取或劫持用户的会话。此问题已在版本 1.2.8 中修复。

CVSS 5.1 · Medium Updated Oct 27, 2026

Possible ATT&CK Techniques 2 AI

T1055.001 · Dynamic-link Library Injection T1190 · Exploit Public-Facing Application

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Vulnerability Information

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Vulnerability Title

Stored XSS in KGS Software tia Viewer

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
KGS Software	tia Viewer	0 ~ 1.2.8	-

II. Public POCs for CVE-2026-105987

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-105987

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Other References for CVE-2026-105987 (2)

https://cert.pl/en/posts/2026/10/CVE-2026-105987 third-party-advisory
https://www.kgs-software.com/en/products/tia-viewer product

https://www.cve.org/CVERecord?id=CVE-2026-105987

IV. Related Vulnerabilities

Same weakness: CWE-79