Cross-site Scripting (XSS)
Affecting dompurify package, versions <0.8.0 >=0.7.3
dompurify is a DOM-only XSS sanitizer for HTML, MathML and SVG.
Affected versions of the package are vulnerable to Cross-site Scripting (XSS) attacks. SVG tags are case sensitive, but DOMPurify transforms these tags to lowercase. This causes the SVG document to render incorrectly, and may trigger a flaw in the Opera browser.
These attacks are possible by escaping the context of the web application and injecting malicious scripts in an otherwise trusted website. These scripts can introduce additional attributes (say, a "new" option in a dropdown list or a new link to a malicious site) and can potentially execute code on the clients side, unbeknown to the victim. This occurs when characters like \< > \" \' are not escaped properly.
There are a few types of XSS:
- Persistent XSS is an attack in which the malicious code persists into the web app’s database.
- Reflected XSS is an which the website echoes back a portion of the request. The attacker needs to trick the user into clicking a malicious link (for instance through a phishing email or malicious JS on another page), which triggers the XSS attack.
dompurify to version 0.8.0 or higher.
Do your applications use this vulnerable package?
- Snyk ID
- 11 Apr, 2016
- 24 Apr, 2017