Smart Slider block attributes permit Contributor-level stored XSS

Smart Slider 3 through 3.5.1.38 does not adequately sanitize and escape the slider block attribute. A Contributor can store script that executes when an Editor or Administrator opens the affected post in the WordPress block editor.

CVE / CNA score 6.4 CVSS 3.1 · security@wordfence.com

NVD score Pending NVD has not published its own CVSS assessment.

Component: Smart Slider 3
Plugin slug: smart-slider-3
Affected: <= 3.5.1.38
Safe version: See mitigation notes
Published: Aug 28, 2026
Weakness: CWE-79 — Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

This CVE was published Aug 28, 2026 and is one of 12 known issues for this plugin.

What to do

Update, patch or deactivate.

No fixed release is confirmed. Update Smart Slider 3 when a release after 3.5.1.38 is confirmed to fix the issue; until then, restrict Contributor access and avoid opening untrusted slider blocks in the editor.

No confirmed safe version is listed. Consider a vendor-supported patch or temporarily restricting the affected functionality while you assess the risk.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical 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.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

References

Primary and upstream sources

Data attribution: This product uses the NVD API but is not endorsed or certified by the NVD.

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