CVE-2025-66103 WordPress WPCal.io plugin <= 0.9.5.9 - Cross Site Scripting (XSS) vulnerability
An attacker can inject malicious scripts into the WPCal.io WordPress plugin, potentially leading to session hijacking or arbitrary code execution in the victim's browser.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-66103?
CVE-2025-66103 is a medium-severity cross-site scripting vulnerability in revmakx WPCal.io, published on 30 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in revmakx WPCal.io wpcal allows DOM-Based XSS.This issue affects WPCal.io: from n/a through <= 0.9.5.9.
Weakness: CWE-79
Which versions are affected by CVE-2025-66103?
How do I fix CVE-2025-66103?
No fix has been published for CVE-2025-66103 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-66103 being exploited?
There is no known exploitation of CVE-2025-66103 in the wild and no public exploit code.
Sources
Also known as GHSA-5f5g-3v7q-886j.