CVE-2025-15663
Received Received - Intake

Stored XSS in Ultimate Before After Image Slider & Gallery WordPress Plugin

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 after-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-2025-15663
EUVD
EUVD-2025-210823

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
beaf ultimate_before_after_image_slider to 4.7.19 (exc)
ultimate_before_after_image_slider 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. Users with the Author role or higher can inject malicious scripts via the slider's after-label value, which then executes in the browsers of anyone viewing the slider, including administrators.

Detection Guidance

Check the installed version of the Ultimate Before After Image Slider & Gallery plugin. If it is below 4.7.19, the system is vulnerable. Log in as an Author or higher role and inspect slider configurations for after-label values containing scripts.

Impact Analysis

An attacker could steal session cookies, perform actions on behalf of users, or redirect users to malicious sites. Administrators viewing the slider could have their accounts compromised, leading to full site takeover.

Compliance Impact

This vulnerability could lead to unauthorized access to user data, violating GDPR's data protection requirements and HIPAA's safeguards for protected health information. Non-compliance may result in legal penalties and reputational damage.

Mitigation Strategies

Update the Ultimate Before After Image Slider & Gallery plugin to version 4.7.19 or later immediately. Remove or disable the plugin if an update is not possible. Review user roles and restrict Author-level access to prevent exploitation.

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