GitHub Advisoryadvisory · npm

GHSA-h6mq-3cj6-h738 Reverse Tabnabbing in showdown

LOW Published 2020-09-03 Modified 2021-10-01 Official page ↗
Ecosystem
npm
Packages
showdown
Severity
Low
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Weaknesses
CWE-1022
Reviewed
2020-08-31

Affected packages

• npm showdown: < 1.9.1 → fixed in 1.9.1

Description

Versions of `showdown` prior to 1.9.1 are vulnerable to Reverse Tabnabbing. The package uses `target='_blank'` in anchor tags, allowing attackers to access `window.opener` for the original page when opening links. This is commonly used for phishing attacks. Recommendation Upgrade to version 1.9.1 or later.

Related

Weakness · CWE (1)

  • CWE-1022 Use of Web Link to Untrusted Target with window.opener Access weakness

References