Remote Code Execution Vulnerability in Holiday Class Post Calendar Plugin for WordPress
CVE-2025-12813

9.8CRITICAL

Key Information:

Vendor

WordPress
Status
Holiday Class Post Calendar
Vendor
CVE Published:
11 November 2025

What is CVE-2025-12813?

The Holiday Class Post Calendar plugin for WordPress is susceptible to a Remote Code Execution vulnerability due to inadequate validation of user-supplied data via the 'contents' parameter. This flaw allows attackers to craft malicious input that is processed by the server, facilitating unauthorized command execution. All versions up to and including 7.1 are affected, and the vulnerability arises from the failure to properly sanitize data when generating cache files, putting affected installations at risk.

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Deploy the Patch

Affected Version(s)

Holiday class post calendar * <= 7.1

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/holiday-class-...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Kenneth Dunn
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