CVE-2025-66500: A stored cross-site scripting (XSS) vulnerability exists in webplugins.foxit.com. A postMessage handler fails to validate the message origin and directly…

PriorityP425medium5.4CVSS 3.1

AVNACLPRLUIRSCCLILAN

EPSS

0.17%

6.9th percentile

A stored cross-site scripting (XSS) vulnerability exists in webplugins.foxit.com. A postMessage handler fails to validate the message origin and directly assigns externalPath to a script source, allowing an attacker to execute arbitrary JavaScript when a crafted postMessage is received.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
foxit	pdf_editor_cloud	< 2025-12-01	2025-12-01
foxit_software_inc	webplugins.foxit.com	—	—

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.