CVE-2020-7777
HIGHjsen - Code Execution via Untrusted Schema required Field
Title source: manualDescription
This affects all versions of package jsen. If an attacker can control the schema file, it could run arbitrary JavaScript code on the victim machine. In the module description and README file there is no mention about the risks of untrusted schema files, so I assume that this is applicable. In particular the required field of the schema is not properly sanitized. The resulting string that is build based on the schema definition is then passed to a Function.apply();, leading to an Arbitrary Code Execution.
References (2)
Core 2
Core References
Exploit, Third Party Advisory x_refsource_misc
https://snyk.io/vuln/SNYK-JS-JSEN-1014670
Broken Link x_refsource_misc
https://github.com/bugventure/jsen/blob/master/lib/jsen.js%23L875
Scores
CVSS v3
7.2
EPSS
0.0203
EPSS Percentile
78.8%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Details
Status
published
Products (2)
jsen_project/jsen
npm/jsen
0npm
Published
Nov 23, 2020
Tracked Since
Feb 18, 2026