EUVD-2026-21225
GHSA-37pc-8f3j-hpmr
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
Lifecycle Timeline
3Description
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.
Analysis
Supply chain compromise in Smart Slider 3 Pro 3.5.1.35 for WordPress and Joomla delivers multi-stage remote access toolkit via compromised update mechanism. Unauthenticated attackers achieve pre-authentication remote code execution through malicious HTTP headers, deploy authenticated backdoors accepting arbitrary PHP/OS commands, create hidden administrator accounts, exfiltrate credentials and API keys, and establish persistence via must-use plugins and core file modifications. …
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Remediation
Within 24 hours: Immediately isolate all WordPress and Joomla installations running Smart Slider 3 Pro 3.5.1.35 from production; take affected sites offline or restrict access to administrators only; capture forensic images of affected systems. Within 7 days: Vendor must release patched version; conduct full malware sweep including inspection of wp-content/mu-plugins/, core files, and database for hidden administrator accounts; audit credential stores, API keys, and authentication logs for exfiltration. …
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External POC / Exploit Code
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