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CVE-2026-34424

CRITICAL 9.3 CVSS 4.0
Published
April 9, 2026
Last modified
June 17, 2026
NVD status
Deferred
Reported by
disclosure@vulncheck.com
Weakness
CWE-506
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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 and versions

  • Nextendweb Smart Slider 3 Pro for WordPress — Version 3.5.1.35
  • Nextendweb Smart Slider 3 Pro for Joomla — Version 3.5.1.35

References

  • mysites.guru https://mysites.guru/blog/smart-slider-3-pro-supply-chain-compromise/
  • patchstack.com https://patchstack.com/articles/critical-supply-chain-compromise-in-smart-slider-3-pro-full-malware-analysis/
  • patchstack.com https://patchstack.com/database/wordpress/plugin/nextend-smart-slider3-pro/vulnerability/wordpress-smart-slider-3-plugin-3-5-1-35-backdoor-vulnerability
  • smartslider.helpscoutdocs.com https://smartslider.helpscoutdocs.com/article/2143-joomla-security-advisory-smart-slider-3-pro-3-5-1-35-compromise
  • smartslider.helpscoutdocs.com https://smartslider.helpscoutdocs.com/article/2144-wordpress-security-advisory-smart-slider-3-pro-3-5-1-35-compromise
  • nvd.nist.gov Official NVD record