CVE-2025-12813 Holiday class post calendar <= 7.1 - Unauthenticated Remote Code Execution via 'contents'
Unauthenticated attackers can execute arbitrary code on the server via the contents parameter in the Holiday class post calendar plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-12813?
CVE-2025-12813 is a critical code injection vulnerability in strix-bubol5 Holiday class post calendar, published on 11 Nov 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-94
Which versions are affected by CVE-2025-12813?
How do I fix CVE-2025-12813?
No fix has been published for CVE-2025-12813 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2025-12813 being exploited?
There is no known exploitation of CVE-2025-12813 in the wild and no public exploit code.
Sources
Also known as GHSA-8h9p-5fxf-7jmx.