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Deserialization of Untrusted DataWeakness · CWE-502

CVE-2026-27437

CRITICAL · 9.8 CVSS v3.1 Published 2026-03-05
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
100/100
Remediation priority · Urgent
Remotely reachable No privileges Zero-click

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 · unedited
Deserialization of Untrusted Data vulnerability in ThemeREX Tennis Club tennis-sportclub allows Object Injection.This issue affects Tennis Club: from n/a through <= 1.2.3.

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 confidence

A deserialization of untrusted data vulnerability in the ThemeREX Tennis Club WordPress theme allows PHP Object Injection. This occurs when the theme deserializes data from an untrusted source (likely a database entry, file, or user input) without proper validation, potentially enabling remote code execution or other attacks via malicious serialized objects.

MitigationUpdate the ThemeREX Tennis Club theme to the latest patched version if available; otherwise, audit and sanitize all data sources that feed into unserialize() calls within the theme, or disable the vulnerable component until a fix is released.

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 checks

Work through these to decide whether this CVE applies to you.

  1. Locate the ThemeREX Tennis Club theme installation
    In your WordPress installation, navigate to wp-content/themes/ and look for a folder named 'trx_tennis' or similar naming convention for the ThemeREX Tennis Club theme. Alternatively, check via WordPress admin under Appearance > Themes.
    Affected if The theme folder exists in your WordPress themes directory.
  2. Identify the installed theme version
    Open the style.css file inside the theme folder and look for the 'Version:' comment in the file header, or check the theme's main PHP file for a version constant or variable.
    Affected if You cannot determine the version, or the version is older than the latest patched release.
  3. Search for vulnerable unserialize() calls
    Use a text search tool (grep, grep -r, or a code editor) to search within the theme folder for the pattern 'unserialize(' - examine all files containing this function call.
    Affected if The theme contains any unserialize() calls that process data from user-controllable sources.
  4. Trace data sources feeding into unserialize()
    For each unserialize() call found, examine the code paths to determine if the input originates from database entries, uploaded files, HTTP request parameters, or other untrusted sources. Look for calls that pass $_POST, $_GET, $_COOKIE, or database query results directly to unserialize().
    Affected if Data from untrusted sources (user input, external files, database fields that can be modified) reaches any unserialize() call without validation.
  5. Check theme settings and database for stored serialized data
    If the theme stores serialized data in WordPress options or post meta, inspect the wp_options table or relevant meta tables for entries containing serialized arrays that may have been crafted maliciously. Use a database query like SELECT * FROM wp_options WHERE option_name LIKE '%themerx%' or check theme-specific option tables.
    Affected if The theme stores serialized data in the database that could be replaced with a malicious payload.

You are affected if the ThemeREX Tennis Club theme is installed and contains unserialize() calls that process data from untrusted sources without validation.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

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 data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Update the ThemeREX Tennis Club theme to the latest patched version if available; otherwise, audit and sanitize all data sources that feed into unserialize() calls within the theme, or disable the vulnerable component until a fix is released.

Have this fixed Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA4.0 h
22.0 hours of engineering $3,860
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-27437 in production — separate from our analysis above.

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What this is

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