CVE-2026-34424: Nextendweb Smart Slider 3 Pro for WordPress · Embedded Malicious Code
Affects Nextendweb Smart Slider 3 Pro for WordPressSource CVE Database V5
Not known to be exploited · CVSS 9.3 Critical.
Data as of 30 Oct 2026, 11:52 UTC
Contested
Critical score, yet low EPSS after six months- EPSS
- 0.5% chance of exploitation in 30 days – higher than 46% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 9 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| NextendwebSmart Slider 3 Pro for WordPress | Affected
| Fixed in– |
| NextendwebSmart Slider 3 Pro for Joomla | Affected
| Fixed in– |
AI-suggested
Until an official fix is released, affected users should consider disabling or uninstalling Smart Slider 3 Pro version 3.5.1.35 and monitoring for suspicious activity related to unauthorized code execution or new administrator accounts. Review and harden update mechanisms and verify the integrity of installed plugins. Avoid using the affected version in production environments until remediation is confirmed.
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.
References
- smartslider.helpscoutdocs.com/article/2144-wordpress-security-advisory-smart-slider-3-pro-3-5-1-35-compromise (opens in a new tab)
- smartslider.helpscoutdocs.com/article/2143-joomla-security-advisory-smart-slider-3-pro-3-5-1-35-compromise (opens in a new tab)
- patchstack.com/database/wordpress/plugin/nextend-smart-slider3-pro/vulnerability/wordpress-smart-slider-3-plugin-3-5-1-35-backdoor-vulnerability (opens in a new tab)
- patchstack.com/articles/critical-supply-chain-compromise-in-smart-slider-3-pro-full-malware-analysis/ (opens in a new tab)
- mysites.guru/blog/smart-slider-3-pro-supply-chain-compromise/ (opens in a new tab)