Hello team, While i was hunting (https://help.nextcloud.com), i found xss there in comment/reply box..
Steps to reproduce 1. go to https://help.nextcloud.com. 2. Click On Any (I'm selecting "Welcome to the Nextcloud forums") 3. Sign in or Sign up in your account. 4. Click Reply.. 5. Type or paste ( <abbr title='" class="comment-link"><a href=' href="'> :-) <abbr title='" ' class="<script>alert(document.cookie)</script>">x</abbr></a> ) Without brackets.. 6. You will get popup (You need to be logged in to do that.) 7. This mean xss payload is executing!
Detail: I think xss payload is executing because you're using old version of akismet.. Akismet 2.5.0-3.1.4 - Is vulnerable to Unauthenticated Stored Cross-Site Scripting (XSS)..