The Highlight WordPress plugin before 0.9.3 does not sanitise its CustomCSS setting, allowing high privilege users to perform Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed
CVSS 3.1MEDIUM 5.4·Network·Low privileges·User interaction·EPSS 0.00624·Published 2021-09-06·Fixed in 0.9.3CWE-79