Description

Nunjucks is a full featured templating engine for JavaScript. Versions 2.4.2 and lower have a cross site scripting (XSS) vulnerability in autoescape mode. In autoescape mode, all template vars should automatically be escaped. By using an array for the keys, such as `name[]=`, it is possible to bypass autoescaping and inject content into the DOM.

Remediation

References

https://nodesecurity.io/advisories/147

https://github.com/mozilla/nunjucks/issues/835

https://github.com/matt-/nunjucks_test

Related Vulnerabilities

CVE-2021-3664 Vulnerability in npm package url-parse

CVE-2018-1999024 Vulnerability in npm package mathjax

CVE-2017-16170 Vulnerability in npm package liuyaserver

CVE-2021-22134 Vulnerability in maven package org.elasticsearch:elasticsearch

CVE-2022-29214 Vulnerability in npm package next-auth

Severity

High

Classification

CWE-79 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Tags

Exploit Third Party Advisory