CVE-2026-4076 Slider Bootstrap Carousel <= 1.0.7 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

What is CVE-2026-4076?

CVE-2026-4076 is a medium-severity cross-site scripting vulnerability in felipermendes Slider Bootstrap Carousel, published on 22 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The Slider Bootstrap Carousel plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'category' and 'template' shortcode attributes in all versions up to and including 1.0.7. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes. The plugin uses extract() on shortcode_atts() to parse attributes, then directly outputs the $category variable into multiple HTML attributes (id, data-target, href) on lines 38, 47, 109, and 113 without applying esc_attr(). Similarly, the $template attribute flows into a class attribute on line 93 without 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.

Weakness: CWE-79

Which versions are affected by CVE-2026-4076?

How do I fix CVE-2026-4076?

No fix has been published for CVE-2026-4076 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2026-4076 being exploited?

There is no known exploitation of CVE-2026-4076 in the wild and no public exploit code.

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-wpp9-gmq8-vmx8.