Arbitrary JavaScript Code Execution in Parsedown (before 1.7.2)

CVE-2019-10905 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:P/A:P

Parsedown before 1.7.2, when safe mode is used and HTML markup is disabled, might allow attackers to execute arbitrary JavaScript code if a script (already running on the affected page) executes the contents of any element with a specific class. This occurs because spaces are permitted in code block infostrings, which interferes with the intended behavior of a single class name beginning with the language- substring.

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