CVE-2026-34424
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedSmart 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceSmart Slider 3 Pro version 3.5.1.35 contains a multi-stage remote access toolkit injected via a compromised update mechanism. The vulnerability allows unauthenticated attackers to achieve pre-authentication remote shell execution through HTTP headers, establish authenticated backdoors accepting arbitrary PHP code or OS commands, create hidden administrator accounts for persistence, and exfiltrate credentials and access keys. Attackers maintain persistence through must-use plugin injections and WordPress core file modifications.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Smart Slider 3 Pro installation and versionCheck your WordPress or Joomla installation for the Smart Slider 3 Pro plugin/component. In WordPress, navigate to Plugins > Installed Plugins and look for 'Smart Slider 3' or check the plugin files for version information in the main PHP file header. In Joomla, check Components for Smart Slider 3.Affected if Smart Slider 3 Pro version 3.5.1.35 is installed, or any version of Smart Slider 3 Pro is present on a system that received updates between the compromise window and mitigation.
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Inspect for hidden administrator accountsIn WordPress, go to Users > All Users and examine the list for any unrecognized administrator accounts, especially those with unusual usernames, recent creation dates, or suspicious email addresses. Check wp_usermeta table for unexpected user_level or capabilities. In Joomla, navigate to Users > Manage and review all users with Super User privileges.
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Search for suspicious backdoor filesExamine the plugin directory (wp-content/plugins/smart-slider-3/ or equivalent) for newly created or modified PHP files outside the standard structure. Look for files with obfuscated code, base64 encoding, or files with names like shell.php, backdoor.php, or files that accept cmd, exec, or action parameters in URLs.
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Check for unexpected must-use pluginsIn WordPress, inspect the wp-content/mu-plugins/ directory for any PHP files that were not intentionally installed by your team. These are auto-loading and can provide persistence. List all files and verify each one was intentionally deployed.
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Verify WordPress/Joomla core file integrityCompare core WordPress or Joomla files against known clean installations. Check critical files like wp-config.php, index.php in root, and .htaccess for unexpected code insertions, particularly near the top of files or in areas that execute on every request.
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Review HTTP header handling indicatorsExamine web server logs and the plugin code for any logic that reads and executes commands from HTTP headers (such as X-Forwarded-For, X-Real-IP, or custom headers). Check the plugin's main entry points for eval(), preg_replace() with /e modifier, or shell_exec() calls triggered by headers.
A system is affected if Smart Slider 3 Pro version 3.5.1.35 is present, or if any version exists alongside unexplained admin accounts, suspicious backdoor files, unauthorized must-use plugins, or modified core files indicating a supply chain compromise.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataOrganizations using Smart Slider 3 Pro 3.5.1.35 should immediately remove the plugin, audit for hidden administrator accounts, scan for backdoors in must-use plugins and core files, rotate all credentials, and restore from a known-clean backup or reinstall WordPress core if core modifications are suspected.
- Consultation4.0 h
- Implementation16.0 h
- Testing8.0 h
- Review / QA4.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-34424 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-34424 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data