CVE-2026-27084
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 · uneditedDeserialization of Untrusted Data vulnerability in ThemeREX Buisson buisson allows Object Injection.This issue affects Buisson: from n/a through <= 1.1.11.
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 · moderate confidenceA deserialization of untrusted data vulnerability (Object Injection) in the ThemeREX Buisson WordPress theme allows attackers to inject malicious PHP objects via unserialize() on user-controlled data, potentially leading to remote code execution if POP chains exist in the application.
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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Verify ThemeREX Buisson plugin presenceLocate the plugin directory in the WordPress installation (typically wp-content/plugins/) or check via WordPress admin panel under Plugins > Installed Plugins. Confirm the plugin files exist and the plugin is activated.Affected if if the ThemeREX Buisson plugin is installed and activated on the WordPress site
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Determine installed plugin versionOpen the main plugin PHP file (usually trx_buisson.php or similar in the plugin directory) and locate the version constant or header comment. Alternatively, check the plugin metadata via WordPress admin or the readme.txt file.Affected if if the version cannot be determined or matches known vulnerable versions (compare against any published affected version ranges)
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Identify deserialization entry pointsReview the plugin source code for unserialize() function calls handling user-supplied input. Search for parameters that accept serialized data (e.g., $_GET, $_POST, $_REQUEST) passed to unserialize(). Common locations include AJAX handlers, shortcode callbacks, or theme customizer processing.Affected if if the plugin contains unserialize() calls processing external input without prior validation
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Check exposure of vulnerable endpointDetermine if the identified deserialization entry point is accessible without authentication. Test the suspected parameter by submitting a minimal serialized payload or by reviewing access control settings in the plugin. Check for any security-related plugin configuration that may restrict access.Affected if if the deserialization handler is accessible to unauthenticated users (remote attack vector exists)
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Audit for exploitation indicatorsReview web server access logs for suspicious requests containing serialized PHP data patterns (e.g., O: length:). Examine the uploads directory and wp-content for unexpected PHP files. Check database for unauthorized content or modifications.Affected if if logs show serialized data submissions or unexpected files/scripts exist on the server
The environment is affected if the ThemeREX Buisson plugin is installed with a vulnerable version that exposes an unauthenticated unserialize() entry point processing user input.
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.
dbcve · scopedUpgrade to the latest version of Buisson theme immediately. Until a patched version is available, disable the theme or implement input validation/sanitization on all data passed to unserialize() functions.
Latest available version of ThemeREX Buisson theme (newer than 1.1.11)
- 1. Log in to the WordPress admin dashboard
- 2. Navigate to Appearance > Themes
- 3. Locate the ThemeREX Buisson theme
- 4. Check if an updated version is available in the WordPress theme repository or from ThemeREX
- 5. If an updated version is available, install and activate it
- 6. If no update is available from official sources, consider: a) using an alternative theme, or b) implementing web application firewall rules to block PHP object injection attempts
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation3.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,984.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-27084 — 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-2026-27084 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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- 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
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