Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Wagtail is an open source content management system built on Django. In versions 1.5 through 4.1.3, 4.2rc1 through 4.2.1, a stored cross-site scripting (XSS) vulnerability exists on ModelAdmin views within the Wagtail admin interface. A user with a limited-permission editor account for the Wagtail admin could potentially craft pages and documents that, when viewed by a user with higher privileges, could perform actions with that user's credentials. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin, and only affects sites with ModelAdmin enabled. For page, the vulnerability is in the "Choose a parent page" ModelAdmin view ("ChooseParentView"), available when managing pages via ModelAdmin. For documents, the vulnerability is in the ModelAdmin Inspect view ("InspectView") when displaying document fields. Site owners who are unable to upgrade to the new versions can disable or override the corresponding functionality.
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.