Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Gogs is an open source self-hosted Git service. In versions of gogs prior to 0.12.9-rc.1 "DisplayName" does not filter characters input from users, which leads to Cross-site Scripting vulnerability when directly displayed in the issue list. This issue has been resolved in commit 155cae1d which sanitizes "DisplayName" prior to display to the user. All users of gogs are advised to upgrade. Users unable to upgrade should check their users' display names for malicious characters.
CWE-79 - Cross Site Scripting
Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.