CVE-2026-15726: Serious Slider <= 1.4.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'theme' Shortcode Attribute
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-15726?
CVE-2026-15726 has a severity rating of medium with a score of 6.4.
Who can exploit the vulnerability in CVE-2026-15726?
CVE-2026-15726 can be exploited by authenticated attackers with contributor-level access.
How do I fix CVE-2026-15726?
To fix CVE-2026-15726, update the Serious Slider plugin to a version later than 1.4.0.
What type of vulnerability is CVE-2026-15726?
CVE-2026-15726 is a Stored Cross-Site Scripting (XSS) vulnerability.
What is the impact of CVE-2026-15726 on my WordPress site?
CVE-2026-15726 allows authenticated contributors to inject malicious scripts that can execute in the context of other users' sessions.