CVE-2026-18400 Cross-site scripting in Slider, Gallery, and Carousel by MetaSlider – Image Slider, Video Slider
Authenticated attackers can inject arbitrary scripts via the delay setting, leading to stored XSS execution on victim pages.
- 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-2026-18400?
CVE-2026-18400 is a medium-severity cross-site scripting vulnerability in Slider, Gallery, and Carousel by MetaSlider – Image Slider, Video Slider, published on 6 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Slider, Gallery, and Carousel by MetaSlider – Image Slider, Video Slider plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'delay' Post Meta Setting in all versions up to, and including, 3.111.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with custom-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The ml-slider custom post type is registered without custom capability restrictions and the ml-slider_settings meta key is unprotected, allowing Author-level users to set the malicious delay value via XML-RPC custom_fields when creating an ml-slider post.
Weakness: CWE-79
Which versions are affected by CVE-2026-18400?
How do I fix CVE-2026-18400?
No fix has been published for CVE-2026-18400 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-2026-18400 being exploited?
There is no known exploitation of CVE-2026-18400 in the wild and no public exploit code.
Sources
Also known as GHSA-mrw5-7p4v-67jq.