CVE-2026-34424 json
Smart Slider 3 Pro 3.5.1.35 Supply Chain Attack Remote Access Toolkit
published 2026-04-09 7 mo ago modified 2026-06-17 4 mo ago also EUVD-2026-21225
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 46%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- Nextendweb Smart Slider 3 Pro for WordPress 3.5.1.36
- Nextendweb Smart Slider 3 Pro for Joomla 3.5.1.36
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 6 mo ago
Exploit prediction
0.56% chance of exploitation in the next 30 days, higher than 46% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | 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 |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 4.0 | 9.3 | 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 |
Affected products
- Nextendweb Smart Slider 3 Pro for WordPress
- Nextendweb Smart Slider 3 Pro for Joomla
Classification
- Weakness
-
- CWE-506 Embedded Malicious Code
- Technology feeds
References
-
smartslider.helpscoutdocs.com
/article/2144-wordpress-security-advisory-smart-slider-3-pro-3-5-1-35-compromise
vendor-advisory, patch
-
smartslider.helpscoutdocs.com
/article/2143-joomla-security-advisory-smart-slider-3-pro-3-5-1-35-compromise
vendor-advisory, patch
-
patchstack.com
/database/wordpress/plugin/nextend-smart-slider3-pro/vulnerability/wordpress-smart-slider-3-plugin-3-5-1-35-ba
third-party-advisory
-
patchstack.com
/articles/critical-supply-chain-compromise-in-smart-slider-3-pro-full-malware-analysis/
technical-description
-
mysites.guru
/blog/smart-slider-3-pro-supply-chain-compromise/
technical-description
Sources
- CVE List CVE-2026-34424
- NVD CVE-2026-34424
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.