TI-2026-81354 Aliases CVE-2026-105987 GHSA-52vr-mm4v-p8xx

Stored XSS in KGS Software tia Viewer

LOW 23CWE-79Published 2026-10-27 · Updated 2026-11-04

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: None · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

KGS Software tia Viewer before 1.2.8 contains a stored cross-site scripting flaw in the annotation API (CWE-79). The viewer does not validate input in stickynote annotations, so an authenticated attacker can store arbitrary JavaScript in an annotation. When another user opens the document, the browser runs the script, which may compromise that user's session.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00239 15th percentileScored 2026-11-07

Fix Fixed tia Viewer (KGS Software): 1.2.8

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
KGS Software	tia Viewer	before 1.2.8	1.2.8	Patch available	CNA

tia Viewer VendorKGS Software Affected before 1.2.8 Fixed in 1.2.8 Patch available CNA

Remediation

Update KGS Software tia Viewer to version 1.2.8, which fixes the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Fix · CNA tia Viewer (KGS Software) Fixed in 1.2.8

Timeline

2026-10-27 Threatist record created from CVE-2026-105987
2026-10-27 Alias added: GHSA-52vr-mm4v-p8xx
2026-11-04 CISA SSVC decision points changed

References

Advisory 1

https://cert.pl/en/posts/2026/10/CVE-2026-105987

Other 1

https://www.kgs-software.com/en/products/tia-viewer

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences