CVE-2021-39307

6.1 mediumEPSS 1.1%

Medium (6.1) in pdftron webviewer ui. EPSS 1.1% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

6.1 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 1.1% chance of exploitation in the next 30 days; higher than 66% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2021-09-15
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

pdftron:webviewer_ui

References

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

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