Nextendweb Smart Slider 3 Pro Plugin up to 3.5.1.35 on WordPress/Joomla malicious code

Summaryinfo

A vulnerability categorized as critical has been discovered in Nextendweb Smart Slider 3 Pro Plugin up to 3.5.1.35 on WordPress/Joomla. Affected by this vulnerability is an unknown functionality. Executing a manipulation can lead to malicious code. This vulnerability is handled as CVE-2026-34424. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Nextendweb Smart Slider 3 Pro Plugin up to 3.5.1.35 on WordPress/Joomla. It has been declared as critical. This vulnerability affects an unknown functionality. The manipulation with an unknown input leads to a malicious code vulnerability. The CWE definition for the vulnerability is CWE-506. The product contains code that appears to be malicious in nature. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at smartslider.helpscoutdocs.com. This vulnerability was named CVE-2026-34424 since 03/27/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 3.5.1.34 or 3.5.1.36 eliminates this vulnerability.

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Productinfo

Vendor

• Nextendweb

Name

• Smart Slider 3 Pro Plugin

Version

• 3.5.1.0
• 3.5.1.1
• 3.5.1.2
• 3.5.1.3
• 3.5.1.4
• 3.5.1.5
• 3.5.1.6
• 3.5.1.7
• 3.5.1.8
• 3.5.1.9
• 3.5.1.10
• 3.5.1.11
• 3.5.1.12
• 3.5.1.13
• 3.5.1.14
• 3.5.1.15
• 3.5.1.16
• 3.5.1.17
• 3.5.1.18
• 3.5.1.19
• 3.5.1.20
• 3.5.1.21
• 3.5.1.22
• 3.5.1.23
• 3.5.1.24
• 3.5.1.25
• 3.5.1.26
• 3.5.1.27
• 3.5.1.28
• 3.5.1.29
• 3.5.1.30
• 3.5.1.31
• 3.5.1.32
• 3.5.1.33
• 3.5.1.34
• 3.5.1.35

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