Document Gallery WordPress plugin vulnerabilities

The Document Gallery WordPress plugin through 5.1.1 does not verify the signature on one of its unauthenticated webhook endpoints when no shared secret has been configured, which is the default state. This allows unauthenticated users to replace the thumbnail image the site publishes for any document.

The Document Gallery WordPress plugin through 5.1.1 does not sanitise or escape several gallery shortcode attributes before embedding them in a single-quoted HTML attribute in the rendered gallery markup. This allows users with the Contributor role and above to inject arbitrary event handlers that execute when a higher privileged user views the content.

The Document Gallery WordPress plugin through 5.1.1 does not perform any capability or ownership check when generating a gallery on demand, allowing unauthenticated users to enumerate and disclose the titles, descriptions and direct file URLs of media attached to unpublished, private or trashed content.