CVE-2026-105987
Stored XSS in KGS Software tia Viewer
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| tia Viewer KGS Software |
≥ 0; < 1.2.8 (affected, semver)
Other versions: unaffected |
CNA: CERT-PL |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 5.1 medium |
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 | CNA: CERT-PL |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://cert.pl/en/posts/2026/10/CVE-2026-105987CNA: CERT-PL · third-party-advisory
- https://www.kgs-software.com/en/products/tia-viewerCNA: CERT-PL · product
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