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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
2026-07-23
Advisory published
2026-06-06
Advisory updated
2026-07-23

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-8900 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-8900

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-8900 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-8900

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.