Medium severity · published Dec 19, 2025
CVE-2025-66500
Foxit webplugins.foxit.com Stored Cross-Site Scripting via postMessage Vulnerability
5.4
CVSS
0.2%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 11% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WE
webplugins.foxit.com · Foxit Software Inc.
before 2025‑12‑01 · source: vendor
PE
Pdf Editor Cloud · Foxit
before 2025-12-01 · source: NVD