CVE-2026-15726
Received Received - Intake

Stored XSS in Serious Slider WordPress Plugin

Publication date: 2026-08-16

Last updated on: 2026-08-16

Assigner: Wordfence

Description
The Serious Slider plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'theme' Shortcode Attribute in all versions up to, and including, 1.4.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

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Meta Information

Published
2026-08-16
Last Modified
2026-08-16
Generated
2026-08-16
AI Q&A
2026-08-16
EPSS Evaluated
N/A
NVD
CVE-2026-15726
EUVD
EUVD-2026-59867

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
serious_slider serious_slider to 1.4.0 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Serious Slider WordPress plugin affecting versions up to 1.4.0. It occurs due to insufficient input sanitization and output escaping in the 'theme' shortcode attribute. Authenticated attackers with contributor-level access or higher can inject malicious scripts into pages. These scripts execute when users view the affected pages.

Detection Guidance

Check WordPress plugins for Serious Slider versions up to 1.4.0. Inspect pages using the 'theme' shortcode for suspicious scripts. Review contributor-level user activity logs for unauthorized edits.

Impact Analysis

An attacker could steal user session cookies, redirect users to malicious sites, or perform actions on their behalf. This could lead to account takeovers, data theft, or defacement of your WordPress site. Users visiting infected pages may have their browsers compromised.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality principles. For HIPAA, it may compromise protected health information if exploited. Both standards require protection against unauthorized code execution and data breaches.

Mitigation Strategies

Update Serious Slider plugin to the latest version. Remove or disable the plugin if unused. Implement input sanitization for shortcode attributes. Monitor pages for unexpected script injections.

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