The OAuth Client by DigitialPixies WordPress plugin through 1.1.0 does not sanitize and escapes some of its settings, which could allow high-privilege users such as admin to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example, in multisite setup).
https://wpscan.com/vulnerability/13966b61-7e65-4493-8bd8-828d6d4441d5