CVE-2025-15664
Received Received - Intake

Before-After Image Slider DOM XSS in WordPress

Publication date: 2026-09-02

Last updated on: 2026-09-02

Assigner: WPScan

Description
The Ultimate Before After Image Slider & Gallery WordPress plugin before 4.7.19 does not properly escape the slider's before-label value before its bundled client-side script re-injects it into the DOM, allowing users with the Author role and above to store a payload that executes in the browser of anyone (including an administrator) who views the slider.

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Meta Information

Published
2026-09-02
Last Modified
2026-09-02
Generated
2026-09-02
AI Q&A
2026-09-02
EPSS Evaluated
N/A
NVD
CVE-2025-15664
EUVD
EUVD-2025-210822

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
beaf ultimate_before_after_image_slider to 4.7.19 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a stored cross-site scripting (XSS) vulnerability in the Ultimate Before After Image Slider & Gallery WordPress plugin. It occurs because the plugin does not properly escape the before-label value in sliders before a client-side script re-injects it into the DOM. This allows users with Author role or higher to inject malicious scripts that execute in the browsers of anyone viewing the slider, including administrators.

Detection Guidance

Check the installed version of the Ultimate Before After Image Slider & Gallery WordPress plugin. If it is below 4.7.19, the system is vulnerable. Log in as an Author role user or higher and inspect slider configurations for unsanitized 'before-label' values that may contain scripts.

Impact Analysis

An attacker with Author role or higher could inject malicious scripts into sliders. When an administrator or other user views the slider, the script executes in their browser, potentially stealing session cookies, performing actions on their behalf, or redirecting them to malicious sites. This could lead to unauthorized access to the WordPress site or compromise of user accounts.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate GDPR if personal data is exposed or HIPAA if protected health information is compromised. Organizations could face fines or penalties for failing to protect user data adequately.

Mitigation Strategies

Update the Ultimate Before After Image Slider & Gallery plugin to version 4.7.19 or later immediately. Remove or restrict Author role users' access until the update is applied. Scan for any injected scripts in slider configurations.

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