TI-2021-16679 Aliases CVE-2021-39307 GHSA-h97p-5fjq-c93c

PDFTron's WebViewer UI 8.0 or below renders dangerous URLs as hyperlinks in supported…

LOW 29CWE-79Published 2021-09-15 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

PDFTron's WebViewer UI 8.0 or below renders dangerous URLs as hyperlinks in supported documents, including JavaScript URLs, allowing the execution of arbitrary JavaScript code.

Why it matters now

EPSS 0.01116 66th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:pdftron:webviewer_ui::::::::	up to 8.0	Vulnerable	Pdftron

cpe:2.3:a:pdftron:webviewer_ui:*:*:*:*:*:*:*:* Versions up to 8.0 Vulnerable ·Pdftron

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2021-39307
2026-10-03 Alias added: GHSA-h97p-5fjq-c93c

References

Exploit 1

https://research.nccgroup.com/2021/09/14/technical-advisory-pdftron-javascript-urls-allowed-in-webviewer-ui-cve-2021-39307/

Advisory 1

https://www.pdftron.com/webviewer/

Sources

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