Input validation vulnerability in Kudos Donations – Easy donations and payments with Mollie 3.2.9

The “Kudos Donations – Easy donations and payments with Mollie” plugin for WordPress has a security issue called Reflected Cross-Site Scripting. This is because a certain function called `add_query_arg` was not properly used, allowing attackers to insert harmful scripts into a website. This can happen if a user unknowingly clicks on a malicious link.

Detected in:

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> from 2.2.8
= including 2.2.8 & 2.2.21
< to 2.2.21

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