One of the changelog entries for the latest version of WP 1 Slider is “Fix security issues.” Looking at the changes made we found that sanitization was being added, though some of the code involved didn’t seem to make sense. In testing things out to try to understand how the code work we found that the sanitization added didn’t fully resolve the issue and there is still an authenticated persistent cross-site scripting (XSS) vulnerability in the new version.

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This post provides insights on a vulnerability in the WordPress plugin WP 1 Slider 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.

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