When using the "insert media" functionality, the linked oEmbed JSON includes an HTML attribute which will replace the embed shortcode. The HTML is not sanitized before replacing the shortcode, allowing a script payload to be executed on both the CMS and the front-end of the website.
James Nicoll from Fujitsu Cyber Security Services
{ "nvd_published_at": "2025-01-14T23:15:08Z", "cwe_ids": [ "CWE-79" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2025-01-14T22:18:52Z" }