URLs using "javascript:" have the protocol removed when pasted into the addressbar to protect users from cross-site scripting (XSS) attacks, but if a tab character is embedded in the "javascript:" URL the protocol is not removed and the script will execute. This could allow users to be socially engineered to run an XSS attack against themselves. This vulnerability affects Firefox < 59.

Related CVEs

CVE-2018-5143

Key Information

GHSA ID

GHSA-qqw6-4m7h-4hwr

Published

May 14, 2022 3:10 AM

Last Modified

May 14, 2022 3:10 AM

CVSS Score

5.0 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: September 12, 2025 6:34 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.