CVSS base score
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
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.
Explanation of Vulnerability in Simple Terms
Holiday class post calendar versions 7.1 and earlier contain a code injection vulnerability that allows unauthenticated attackers to run arbitrary PHP code on the site without user interaction. The vulnerability stems from improper input validation in the calendar processing logic. An attacker can exploit this remotely over the network to gain full control of the affected site.
What an attacker can do
Run arbitrary PHP code on the site and take complete control of it.
Potential impact on your site
Complete site compromise: attackers can steal data, modify content, install malware, or take the site offline.
Conditions required to exploit
Network access only; no authentication or user interaction required.
Key dates
External resources
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