CVE-2026-4065

Smart Slider 3 <= 3.5.1.33 - Missing Authorization to Authenticated (Contributor+) Slider Data Read and Image Record Manipulation

2026-04-07 08:51
normaandersonfrank

Strategic Overview

Status
Patched in 3.5.1.34
Affected Plugin
Smart Slider 3
Affected Version
<= 3.5.1.33
CVSS
5.4Medium
Weakness type
CWE-862 · Missing Authorization
CVE
CVE-2026-4065
View all Smart Slider 3 vulnerabilities

At a glance

CVE-2026-4065 is a medium-severity Missing Authorization vulnerability in the Smart Slider 3 WordPress plugin, affecting versions <= 3.5.1.33. It carries a CVSS score of 5.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 3.5.1.34; sites on affected versions should update now. Disclosed April 2026, reported by normaandersonfrank.

Vulnerability Overview

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.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

CWE-862: Missing Authorization

Smart Slider 3 <= 3.5.1.33 carries this weakness at display_admin_ajax(), and reaching it takes an account at Contributor level or above. A missing authorization check means a function is reachable by anyone who can reach the endpoint, because the code never asks whether the caller is allowed to perform the action.

Any user who can reach the endpoint gets to run an action reserved for higher-privileged roles, from reading protected data to changing settings or content. For Smart Slider 3 the fix is 3.5.1.34: builds <= 3.5.1.33 are affected, anything from 3.5.1.34 onward is not.

Remediation

Update to version 3.5.1.34, or a newer patched version

How does WordSec protect against this?

Because it turns on account access, WordSec's login security is the relevant layer: role-based two-factor, captcha and brute-force limits raise the cost of getting the account this needs. None of that substitutes for the fix: Smart Slider 3 3.5.1.34 closes this, and updating the plugin is the step that ends it.

  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-4065https://www.wordfence.com/threat-intel/vulnerabilities/id/53a08b59-b7e0-419a-bfc3-528bcddb1ac2https://nvd.nist.gov/vuln/detail/CVE-2026-4065

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C