Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

Related CVEs

CVE-2021-38509

Key Information

GHSA ID

GHSA-hw7m-5984-jp2q

Published

December 9, 2021 12:00 AM

Last Modified

March 17, 2022 12:06 AM

CVSS Score

5.0 /10

Primary Ecosystem

Unknown

Primary Package

Unknown

GitHub Reviewed

✗ No

Dataset

Last updated: September 9, 2025 6:37 AM

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