CVE-2026-8900 Simple SEO Slideshow <= 1.2.8 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes
Authenticated contributors can inject malicious scripts via shortcode attributes, leading to script execution for visitors and potential account takeover.
- 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-2026-8900?
CVE-2026-8900 is a medium-severity cross-site scripting vulnerability in spyrosvl Simple SEO Slideshow, published on 5 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The Simple SEO Slideshow plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Shortcode Attributes in all versions up to, and including, 1.2.8 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. WordPress KSES does not strip malicious shortcode attribute values on post save, allowing contributor-level users to persist payloads that execute for any visitor, including administrators reviewing the post.
Weakness: CWE-79
Which versions are affected by CVE-2026-8900?
How do I fix CVE-2026-8900?
No fix has been published for CVE-2026-8900 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-2026-8900 being exploited?
There is no known exploitation of CVE-2026-8900 in the wild and no public exploit code.
Sources
Also known as GHSA-vw38-cqg7-qmjq.