One of the changelog entries for the latest version of the plugin Sign-up Sheets is “Fixed sanitization security issue”. Looking at the changes made in that version, we found that the issue wasn’t really one issue, but a general lack of sanitization, escaping, and validation. It looks like that could still be further improved.

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This post provides insights on a vulnerability in the WordPress plugin Sign-up Sheets not discovered by us, where the discoverer hadn't provided the details needed for us to confirm the vulnerability while we were adding it to the data set for our service, so the rest of its contents are limited to subscribers of our service.

If you were using our service, you would have already been warned about this vulnerability if your website is vulnerable due to it. You can try out our service for free and then see the rest of the details of the vulnerability.

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