CVE-2014-9772
XSS Filter Bypass via Encoded URL in validator
Description
Versions of `validator` prior to 2.0.0 contained an xss filter method that is affected by several filter bypasses. This may result in a cross-site scripting vulnerability. ## Proof of Concept The xss() function removes the word "javascript" when contained inside an attribute. However, it does not properly handle cases where characters have been hex-encoded. As a result, it is possible to build an input that bypasses the filter but which the browser will accept as valid JavaScript. For example: ```<a href="javascript:...">abc</a>``` will render as: ```<a href="javascript:...">abc</a>``` ## Recommendation The package author has decided to remove the xss filter functionality in the latest version of this module. If this feature is not currently being used, you are not affected by the vulnerability. If it is being used, updating to the latest version of the module will break your application. In order for affected users to mitigate this vulnerability, it is necessary to use an [alternative package](https://www.npmjs.com/search?q=xss%20filter&page=1&ranking=optimal) that provides similar functionality.
How to fix CVE-2014-9772
To remediate CVE-2014-9772, upgrade the affected package to a fixed version below.
- —upgrade to 2.0.0 or later
Is CVE-2014-9772 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 2.0.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM6.1 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |