CVE-2026-15798 Smart Slider 3 <= 3.5.1.38 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'slider' Block Attribute
Authenticated contributors can inject scripts via slider attributes, targeting editors and admins in the block editor.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15798?
CVE-2026-15798 is a medium-severity cross-site scripting vulnerability in nextendweb Smart Slider 3, published on 28 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Smart Slider 3 plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'slider' Block Attribute in all versions up to, and including, 3.5.1.38 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. The injected scripts execute specifically when a user opens the affected post in the WordPress block editor, making Editors and Administrators the primary targets.
Weakness: CWE-79
Which versions are affected by CVE-2026-15798?
How do I fix CVE-2026-15798?
No fix has been published for CVE-2026-15798 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-2026-15798 being exploited?
There is no known exploitation of CVE-2026-15798 in the wild and no public exploit code.
Sources
Also known as GHSA-mcvf-8xhh-c3q4.