Vulnerability · Published Apr 9, 2026 · Assigned by VulnCheck
CVE-2026-34424Smart Slider 3 Pro 3.5.1.35 Supply Chain Attack Remote Access Toolkit
Critical 9.8
In plain English
A critical-severity security flaw in Smart Slider 3 Pro for Joomla from Nextendweb. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).
Official description
Smart Slider 3 Pro version 3.5.1.35 for WordPress and Joomla contains a multi-stage remote access toolkit injected through a compromised update system that allows unauthenticated attackers to execute arbitrary code and commands. Attackers can trigger pre-authentication remote shell execution via HTTP headers, establish authenticated backdoors accepting arbitrary PHP code or OS commands, create hidden administrator accounts, exfiltrate credentials and access keys, and maintain persistence through multiple injection points including must-use plugins and core file modifications.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Nextendweb | Smart Slider 3 Pro for WordPress | 3.5.1.35 |
| Nextendweb | Smart Slider 3 Pro for Joomla | 3.5.1.35 |
Weakness: CWE-506 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://smartslider.helpscoutdocs.com/article/2144-wordpress-security-advisory-smart-slider-3-pro-3-5-1-35-compromise vendor-advisory, patch
- https://smartslider.helpscoutdocs.com/article/2143-joomla-security-advisory-smart-slider-3-pro-3-5-1-35-compromise vendor-advisory, patch
- https://patchstack.com/database/wordpress/plugin/nextend-smart-slider3-pro/vulnerability/wordpress-smart-slider-3-plugin-3-5-1-35-backdoor-vulnerability third-party-advisory
- https://patchstack.com/articles/critical-supply-chain-compromise-in-smart-slider-3-pro-full-malware-analysis/ technical-description
- https://mysites.guru/blog/smart-slider-3-pro-supply-chain-compromise/ technical-description