GHSA-62m3-fc7f-jpp8
Parsedown Class-Name Injection
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| Packagist | erusev/parsedown | < 1.7.2 | 1.7.2 |
Details
As written in the advisory (Markdown source, shown as plain text).
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.
References
External links from the advisory. They lead to third-party sites.