An issue was discovered in Mailman Core before 3.3.5. An attacker with access to the REST API could use timing attacks to determine the value of the configured REST API password and then make arbitrary REST API calls. The REST API is bound to localhost by default, limiting the ability for attackers to exploit this, but can optionally be made to listen on other interfaces.
Mailman before 2.1.5 allows remote attackers to obtain user passwords via a crafted email request to the Mailman server.
Cross-site scripting (XSS) vulnerability in the driver script in mailman before 2.1.5 allows remote attackers to inject arbitrary web script or HTML via a URL, which is not properly escaped in the resulting error page.
Cross-site scripting (XSS) vulnerability in options.py for Mailman 2.1 allows remote attackers to inject script or HTML into web pages via the (1) email or (2) language parameters.
In GNU Mailman, a list member or moderator can get a CSRF token and craft an admin request (using that token) to set a new admin password or make other changes.
An issue was discovered in GNU Mailman A crafted URL can cause arbitrary text to be displayed on a web page from a trusted site.