Cross-Site Scripting

Overview

Versions of mustache prior to 2.2.1 are affected by a cross-site scripting vulnerability when attributes in mustache templates are not quoted.

Example

Template:
<a href />

Input:
{ 'foo' : 'test.com onload=alert(1)'}

Rendered result:
<a href />

Recommendation

Update to version 2.2.1 or later.
Alternatively, ensure that all attributes in hmustache templates are encapsulated with quotes.

References

• Commit #378bcca
• GitHub Advisory