Smart Slider 3: A security weakness

Smart Slider 3 is affected by a security weakness. Exploitation requires an authenticated contributor account. The resulting impact depends on how the affected component exposes the vulnerable operation. The published affected range is <= 3.5.1.33.

CVE / CNA score 5.4 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: <= 3.5.1.33
Safe version: See mitigation notes
Published: Apr 07, 2026
Weakness: CWE-862 — Missing Authorization

This CVE was published Apr 07, 2026 and is one of 12 known issues for this plugin.

What to do

Update, patch or deactivate.

This archive could not verify a fixed version from the official author release notes reviewed on 2026-10-13. Disable the affected feature or component where practical until remediation for the deployed configuration is established. Official author release notes: https://wordpress.org/plugins/smart-slider-3/.

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 unauthorized access and modification of data due to missing capability checks on multiple wp_ajax_smart-slider3 controller actions in all versions up to, and including, 3.5.1.33. The display_admin_ajax() method does not call checkForCap() (which requires unfiltered_html capability), and several controller actions only validate the nonce (validateToken()) without calling validatePermission(). This makes it possible for authenticated attackers, with Contributor-level access and above, to enumerate slider metadata and create, modify, and delete image storage records by obtaining the nextend_nonce exposed on post editor pages.

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

References

Primary and upstream sources

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