CVE-2026-27437 CRITICAL

CVE-2026-27437: WordPress Tennis Club theme <= 1.2.3 - PHP Object Injection vulnerability

Vendor Themerex

Product Tennis Club

Weakness CWE-502 · Unsafe deserialization

Published March 5, 2026

Last update April 28, 2026

View on NVD All CVEs

CVSS base score

9.8/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality High

Integrity High

CVSS vector

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

What the vulnerability does

01Description

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.

Explanation of Vulnerability in Simple Terms

02Summary

Tennis Club versions 1.2.3 and earlier contain a deserialization vulnerability that allows unauthenticated attackers to execute arbitrary code on the site without user interaction. The vulnerability stems from unsafe handling of serialized data, enabling remote code execution through network requests. All versions up to 1.2.3 are affected.

What an attacker can do

03Attacker Capabilities

Run arbitrary code on the site and take complete control of it.

Potential impact on your site

04Site Impact

Complete site compromise: attackers can steal data, modify content, install malware, or take the site offline.

Conditions required to exploit

05Prerequisites

Network access only; no authentication or user interaction required.

Key dates

06Disclosure timeline

March 5, 2026 CVE published

April 28, 2026 Record updated

External resources

07References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2026-27437 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/502.html AskarLabs — CWE-502 write-up Deserialization of Untrusted Data

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