CVE-2018-1000874

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CVE-2018-1000874

Summary:

Details: PHP cebe markdown parser version 1.2.0 and earlier contains a Cross Site Scripting (XSS) vulnerability in all distributed parsers allowing a malicious crafted script to be executed that can result in the lose of user data and sensitive user information. This attack can be exploited by crafting a three backtick wrapped payload with a character in front: L: "```<script>alert();</script>```". NOTE: This has been argued as a non-issue (see references) since it is not the parser's job to sanitize malicious code from a parsed document

References: https://github.com/cebe/markdown/issues/166, https://github.com/cebe/markdown/issues/166#issuecomment-508230493