I can't seem to find any standard or specs on what HTML tags are allowed in the title or content of RSS feed or ATOM feed items. I was wondering if <form> tags are allowed (as in emails) and whether it can open some CORS/CSRF vulnerabilities.

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If a webapp has not been careful and has used GET requests for non-safe actions, it can be exploited by other sites using forged requests. If does not even need any user action because CORS is not enforced on <img> tag where the src attribute can fetch a resource on the victim domain.

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