CVE-2019-10905 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://github.com/erusev/parsedown/issues/699 https://github.com/erusev/parsedown/releases/tag/1.7.2

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.1