PatchSiren cyber security CVE debrief
CVE-2026-8900 spyrosvl CVE debrief
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.
- Vendor
- spyrosvl
- Product
- Simple SEO Slideshow
- CVSS
- MEDIUM 6.4
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-06
- Original CVE updated
- 2026-06-08
- Advisory published
- 2026-06-06
- Advisory updated
- 2026-06-08
Who should care
Users of the Simple SEO Slideshow plugin for WordPress, particularly those with contributor-level access and above, should be aware of this vulnerability and take steps to mitigate it.
Technical summary
The vulnerability is caused by insufficient input sanitization and output escaping in the Simple SEO Slideshow plugin. This allows authenticated attackers to inject arbitrary web scripts in pages, which can execute when a user accesses the injected page.
Defensive priority
MEDIUM
Recommended defensive actions
- Update the Simple SEO Slideshow plugin to a version that fixes the vulnerability.
- Limit contributor-level access to users who do not need it.
- Use a Web Application Firewall (WAF) to detect and prevent cross-site scripting attacks.
Evidence notes
The vulnerability was reported by [email protected] and is tracked in the CVE-2026-8900 record on CVE.org and the NVD detail page.
Official resources
CVE-2026-8900 was published on 2026-06-06T00:16:42.013Z and modified on 2026-06-08T14:57:14.757Z.