CVE-2025-39540 MEDIUM

CVE-2025-39540: WordPress WP Flipclock plugin <= 1.9.1 - Cross Site Scripting (XSS) vulnerability

Vendor Rhys Wynne
Product WP Flipclock
Weakness CWE-79 · XSS
Published April 16, 2025
Last update April 28, 2026

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 Rhys Wynne WP Flipclock wp-flipclock allows DOM-Based XSS.This issue affects WP Flipclock: from n/a through <= 1.9.1.

Explanation of Vulnerability in Simple Terms

02Summary

WP Flipclock versions up to 1.9.1 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 to trigger 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 persistent malicious code affecting other site visitors and administrators.

Conditions required to exploit

05Prerequisites

Attacker needs a low-privilege WordPress account and the victim must view a page containing the injected script.

Key dates

06Disclosure timeline

April 16, 2025 CVE published
April 28, 2026 Record updated