Vulnerability Report

CVE-2025-66500

Title: Stored Cross-Site Scripting (XSS) via postMessage Origin Validation Bypass

XSS

Proof Of Concept

No public PoC currently indexed for CVE-2025-66500.

CWE Category CWE-79

Published Date Dec 19, 2025

Modified Date Dec 23, 2025

Exploit Status Not Found

Score 6.3 CVSS v3.1

Exploit Probability (EPSS)

0.18%

Vulnerability Summary

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 assigns externalPath to a script source, allowing an attacker to execute arbitrary JavaScript when a crafted postMessage is received.

Impacted Vendors

foxit 1

Reference Links

https://www.foxit.com/support/security-bulletins.html

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.4

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

CHANGED

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

CVSS v3.1

Source Entity 14984358-7092-470d-8f34-ade47a7658a2

Severity MEDIUM

6.3

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2025-66500 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

December 23, 2025 MODIFIED

Vulnerability data or affected products updated.

December 23, 2025 MODIFIED

Vulnerability data updated via NVD.

December 19, 2025 PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction REQUIRED

CVSS Vector String


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

Affected Stack

No specific products linked.