Affected versions of backbone are vulnerable to cross-site scripting when users are allowed to supply input to the Model#Escape function, and the output is then written to the DOM.

The vulnerability occurs as a result of the regular expression used to encode metacharacters failing to take HTML Entities such as < into account.

Recommendation

Update to version 0.5.0 or later.

• https://nvd.nist.gov/vuln/detail/CVE-2016-10537
• https://github.com/jashkenas/backbone/commit/0cdc525961d3fa98e810ffae6bcc8e3838e36d93
• https://backbonejs.org/#changelog
• https://github.com/jashkenas/backbone/compare/0.3.3...0.5.0#diff-0d56d0d310de7ff18b3cef9c2f8f75dcL1008
• https://github.com/jashkenas/backbone/commit/7ae0384120c2552e1c426cda7fb02fdce6ef1076
• https://github.com/jashkenas/backbone/blame/0cdc525961d3fa98e810ffae6bcc8e3838e36d93/backbone.js
• https://github.com/advisories/GHSA-j6p2-cx3w-6jcp