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

5.1MEDIUM

Key Information:

Vendor

Kgs Software

Status
Tia Viewer
Vendor
CVE Published:
27 October 2026

What is 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.

Affected Version(s)

tia Viewer 0 < 1.2.8

References

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

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Dawid Dudek (4c1d8urn)
.