CVE-2025-66103 MEDIUM

CVE-2025-66103: WordPress WPCal.io plugin <= 0.9.5.9 - Cross Site Scripting (XSS) vulnerability

Vendor Revmakx
Product WPCal.io
Weakness CWE-79 · XSS
Published December 30, 2025
Last update April 28, 2026
View on NVD All CVEs

CVSS base score

6.5/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction Required
Confidentiality Low
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in revmakx WPCal.io wpcal allows DOM-Based XSS.This issue affects WPCal.io: from n/a through <= 0.9.5.9.

Explanation of Vulnerability in Simple Terms

02Summary

WPCal.io versions up to 0.9.5.9 contain a stored cross-site scripting (XSS) vulnerability. An authenticated user with low privileges can inject malicious scripts that execute in other users' browsers when they view affected pages. The vulnerability requires user interaction and can affect the confidentiality, integrity, and availability of the site.

What an attacker can do

03Attacker Capabilities

Inject malicious scripts that run in other users' browsers, potentially stealing data or performing actions on their behalf.

Potential impact on your site

04Site Impact

Authenticated users can inject scripts affecting other visitors; impacts site security, user data, and trust.

Conditions required to exploit

05Prerequisites

Attacker must be logged in with low-level user privileges and the victim must view a page containing the injected script.

Key dates

06Disclosure timeline

December 30, 2025 CVE published
April 28, 2026 Record updated