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",
"github_reviewed_at": "2025-01-14T22:18:52Z",
"severity": "MODERATE",
"cwe_ids": [
"CWE-79"
],
"github_reviewed": true
}