CVE-2025-12813

CRITICAL 9.8

Holiday class post calendar <= 7.1 - Unauthenticated Remote Code Execution via 'contents'

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

The Holiday class post calendar plugin for WordPress is vulnerable to Remote Code Execution in all versions up to, and including, 7.1 via the 'contents' parameter. This is due to a lack of sanitization of user-supplied data when creating a cache file. This makes it possible for unauthenticated attackers to execute code on the server.

CWE	CWE-94
Vendor	strix-bubol5
Product	holiday class post calendar
Published	Nov 11, 2025
Last Updated	Apr 8, 2026

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CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

strix-bubol5 / Holiday class post calendar

0 ≤ 7.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/7f7968c4-589c-4949-9f69-4a0ba4db4ea9?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/holiday-class-post-calendar/trunk/holiday_class_post_calendar.php#L1234 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3414925%40holiday-class-post-calendar&new=3414925%40holiday-class-post-calendar&sfp_email=&sfph_mail=

Credits

Kenneth Dunn