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CVE-2025-66500— Foxit webplugins.foxit.com Stored Cross-Site Scripting via postMessage Vulnerability

Quick assessment

Affected
Foxit Software Inc. webplugins.foxit.com
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Foxit PDF Editor是中国福昕（Foxit）公司的一款PDF编辑器。 Foxit PDF Editor存在安全漏洞，该漏洞源于postMessage处理程序未验证消息来源，可能导致存储型跨站脚本。

CVSS 6.3 · Medium EPSS 0.21% · P10
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I. Basic Information for CVE-2025-66500

Vulnerability Information
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Vulnerability Title
Foxit webplugins.foxit.com Stored Cross-Site Scripting via postMessage Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Foxit PDF Editor 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Foxit PDF Editor是中国福昕（Foxit）公司的一款PDF编辑器。 Foxit PDF Editor存在安全漏洞，该漏洞源于postMessage处理程序未验证消息来源，可能导致存储型跨站脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Foxit Software Inc. webplugins.foxit.com before 2025‑12‑01 -

II. Public POCs for CVE-2025-66500

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III. Intelligence Information for CVE-2025-66500

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Same Patch Batch · Foxit Software Inc. · 2025-12-19 · 15 CVEs total

CVE-2025-13941 8.8 HIGH Foxit PDF Reader Update Service Incorrect Permission Assignment Local Privilege Escalation
CVE-2025-66495 7.8 HIGH Foxit PDF Reader Annotation Use-After-Free Remote Code Execution Vulnerability
CVE-2025-66493 7.8 HIGH Foxit PDF Reader AcroForm Use-After-Free Remote Code Execution Vulnerability
CVE-2025-66494 7.8 HIGH Foxit PDF Reader PDF File Parsing Use-After-Free Remote Code Execution Vulnerability
CVE-2025-66499 7.8 HIGH Foxit PDF Reader PDF Parsing Heap-Based Buffer Overflow Remote Code Execution Vulnerabilit
CVE-2025-66501 6.3 MEDIUM Foxit pdfonline.foxit.com Stored Cross-Site Scripting in eSign Predefined Text Feature
CVE-2025-66520 6.3 MEDIUM Foxit pdfonline.foxit.com Stored Cross-Site Scripting in Portfolio SVG Handling
CVE-2025-66521 6.3 MEDIUM Foxit pdfonline.foxit.com Stored Cross-Site Scripting in Trusted Certificates Feature
CVE-2025-66502 6.3 MEDIUM Foxit pdfonline.foxit.com Stored Cross-Site Scripting in Page Templates Feature
CVE-2025-66519 6.3 MEDIUM Foxit pdfonline.foxit.com Stored Cross-Site Scripting in Layer Import Functionality
CVE-2025-66522 6.3 MEDIUM Foxit pdfonline.foxit.com Stored Cross-Site Scripting in Digital IDs Common Name Field
CVE-2025-66497 5.3 MEDIUM Foxit PDF Reader 3D Annotation Out-of-Bounds Memory Access Vulnerability
CVE-2025-66496 5.3 MEDIUM Foxit PDF Reader 3D Annotation Out-of-Bounds Memory Access Vulnerability
CVE-2025-66498 5.3 MEDIUM Foxit PDF Reader 3D Annotation Out-of-Bounds Memory Access Vulnerability

IV. Related Vulnerabilities

Same vendor: Foxit Software Inc.
Same weakness: CWE-79

V. Comments for CVE-2025-66500

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