CVE-2021-21610 log

Severity High
Remote Yes
Type Cross-site scripting
Jenkins allows administrators to choose the markup formatter to use for descriptions of jobs, builds, views, etc. displayed in Jenkins. When editing such a description, users can choose to have Jenkins render a formatted preview of the description they entered. Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not implement any restrictions for the URL rendering the formatted preview of markup passed as a query parameter. This results in a reflected cross-site scripting (XSS) vulnerability if the configured markup formatter does not prohibit unsafe elements (JavaScript) in markup, like Anything Goes Formatter Plugin. Jenkins 2.275, LTS 2.263.2 requires that preview URLs are accessed using POST and sets Content-Security-Policy headers that prevent execution of unsafe elements when the URL is accessed directly.
Group Package Affected Fixed Severity Status Ticket
AVG-1446 jenkins 2.274-1 2.275-1 High Fixed
Date Advisory Group Package Severity Type
20 Jan 2021 ASA-202101-41 AVG-1446 jenkins High multiple issues