Vulnerability in Nextendweb Smart Slider 3 Pro For Joomla
CVE-2026-34424
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.
EPSS: 0.006 (42.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Nextendweb Smart Slider 3 Pro For Joomla — versions 3.5.1.35, 0, 3.5.1.36
- Nextendweb Smart Slider 3 Pro For Wordpress — versions 3.5.1.35, 0, 3.5.1.36
Weakness classification (CWE)
References
- disclosure@vulncheck.com (vendor-advisory, patch)
- disclosure@vulncheck.com (vendor-advisory, patch)
- disclosure@vulncheck.com (third-party-advisory)
- disclosure@vulncheck.com (technical-description)
- disclosure@vulncheck.com (technical-description)
Frequently asked questions
- What is CVE-2026-34424?
- CVE-2026-34424 is a critical-severity vulnerability in Nextendweb Smart Slider 3 Pro For Joomla, classified under CWE-506. CVSS score: 9.8/10. Published 2026-04-09.
- How severe is CVE-2026-34424?
- Critical severity. CVSS v3 base score is 9.8 out of 10.