Server Side Request Forgery (SSRF) vulnerability exists in Discourse 2.3.2 and 2.6 via the email function. When writing an email in an editor, you can upload pictures of remote websites.
{
"severity": "Medium",
"cpes": [
"cpe:2.3:a:discourse:discourse:2.3.2:*:*:*:*:*:*:*",
"cpe:2.3:a:discourse:discourse:2.6.0:-:*:*:*:*:*:*",
"cpe:2.3:a:discourse:discourse:*:*:*:*:*:*:*:*"
]
}