by Kastro
Paper/Archive/CVE-2026-34424

CVE-2026-34424

Nextendweb Smart Slider 3 Pro for WordPress — Smart Slider 3 Pro 3.5.1.35 Supply Chain Attack Remote Access Toolkit

EPSS 0.6%CVSS 9.8
critical.is priorityof 100
39
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 46.1.461 × 209.2No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Smart Slider 3 Pro for WordPress3.5.1.353.5.1.36CNA
Smart Slider 3 Pro for Joomla3.5.1.353.5.1.36CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

patchsmartslider.helpscoutdocs.com/article/2144-wordpress-security-advisory-smart-slider-3-pro-3-5-1-35-compromisepatchsmartslider.helpscoutdocs.com/article/2143-joomla-security-advisory-smart-slider-3-pro-3-5-1-35-compromisewriteuppatchstack.com/database/wordpress/plugin/nextend-smart-slider3-pro/vulnerability/wordpress-smart-slider-3-plugin-3-5-1-35-backdoor-vulnerabilitywriteuppatchstack.com/articles/critical-supply-chain-compromise-in-smart-slider-3-pro-full-malware-analysiswriteupmysites.guru/blog/smart-slider-3-pro-supply-chain-compromise