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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.

PUBLISHED Reserved 2026-03-27 | Published 2026-04-09 | Updated 2026-05-14 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem types

Embedded Malicious Code

Product status

Default status
unaffected

3.5.1.35 (custom)
affected

Any version
unaffected

3.5.1.36 (custom)
unaffected

Default status
unaffected

3.5.1.35 (custom)
affected

Any version
unaffected

3.5.1.36 (custom)
unaffected

References

smartslider.helpscoutdocs.com/...r-3-pro-3-5-1-35-compromise vendor-advisory patch

smartslider.helpscoutdocs.com/...r-3-pro-3-5-1-35-compromise vendor-advisory patch

patchstack.com/...r-3-plugin-3-5-1-35-backdoor-vulnerability third-party-advisory

patchstack.com/...-smart-slider-3-pro-full-malware-analysis/ technical-description

mysites.guru/.../smart-slider-3-pro-supply-chain-compromise/ technical-description

cve.org (CVE-2026-34424)

nvd.nist.gov (CVE-2026-34424)

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