The Cosmos Skin for MediaWiki through 1.35.0 has stored XSS because MediaWiki messages were not being properly escaped. This is related to wfMessage and Html::rawElement, as demonstrated by CosmosSocialProfile::getUserGroups.
CWE-79
CVE-2020-27642
A cross-site scripting (XSS) vulnerability exists in the ‘merge account’ functionality in admins.js in BigBlueButton Greenlight 2.7.6.
CVE-2020-27576
Maxum Rumpus 8.2.13 and 8.2.14 is affected by cross-site scripting (XSS). Users are able to create folders in the web application. The folder name is insufficiently validated resulting in a stored cross-site scripting vulnerability.
CVE-2020-27608
In BigBlueButton before 2.2.28 (or earlier), uploaded presentations are sent to clients without a Content-Type header, which allows XSS, as demonstrated by a .png file extension for an HTML document.
CVE-2020-27428
A DOM-based cross-site scripting (XSS) vulnerability in Scratch-Svg-Renderer v0.2.0 allows attackers to execute arbitrary web scripts or HTML via a crafted sb3 file.
CVE-2020-27459
Chronoforeum 2.0.11 allows Stored XSS vulnerabilities when inserting a crafted payload into a post. If any user sees the post, the inserted XSS code is executed.