The attachment download resource in Atlassian Jira Server and Data Center before 8.5.5, and from 8.6.0 before 8.8.2, and from 8.9.0 before 8.9.1 allows remote attackers to inject arbitrary HTML or JavaScript via a Cross-Site Scripting (XSS) vulnerability issue attachments with a mixed multipart content type.

The quick search component in Atlassian Jira Server and Data Center before 8.9.1 allows remote attackers to inject arbitrary HTML or JavaScript via a Cross-Site Scripting (XSS) vulnerability

The UniversalAvatarResource.getAvatars resource in Jira Server and Data Center before version 8.9.0 allows remote attackers to obtain information about custom project avatars names via an Improper authorization vulnerability.

The WYSIWYG editor resource in Jira Server and Data Center before version 8.8.2 allows remote attackers to inject arbitrary HTML or JavaScript names via an Cross Site Scripting (XSS) vulnerability by pasting javascript code into the editor field.

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to inject arbitrary HTML or JavaScript via a cross site scripting (XSS) vulnerability in the project configuration feature. The affected versions are before version 8.3.0.

Versions before 8.9.1, Various resources in Jira responded with a 404 instead of redirecting unauthenticated users to the login page, in some situations this may have allowed unauthorised attackers to determine if certain resources exist or not through an Information Disclosure vulnerability.

The way in which velocity templates were used in Atlassian Jira Server and Data Center prior to version 8.8.0 allowed remote attackers to gain remote code execution if they were able to exploit a server side template injection vulnerability.

Support zip files in Atlassian Jira Server and Data Center before version 8.6.0 could be downloaded by a System Administrator user without requiring the user to re-enter their password via an improper authorization vulnerability.