Version 1.0.0 fixes this issue by making CNAME optional, rather than default. This allows a threat actor to host / run arbitrary client side code (cross-site scripting) in a user's browser when browsing the vulnerable subdomain. This is a security issue with a self-hosted interactsh server in which the user may not have configured a web client but still have a CNAME entry pointing to GitHub pages, making them vulnerable to subdomain takeover.
Domains configured with interactsh server prior to version 1.0.0 were vulnerable to subdomain takeover for a specific subdomain, i.e `app.` Interactsh server used to create cname entries for `app` pointing to `` as default, which intended to used for hosting interactsh web client using GitHub pages. Interactsh is an open-source tool for detecting out-of-band interactions. ILIAS 7.21 and 8.0_beta1 through 8.2 is vulnerable to reflected Cross-Site Scripting (XSS).
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