Authentication Bypass Affecting firefox-esr package, versions <78.9.0esr-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.13% (49th percentile)

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  • Snyk IDSNYK-DEBIAN12-FIREFOXESR-1546259
  • published24 Mar 2021
  • disclosed31 Mar 2021

Introduced: 24 Mar 2021

CVE-2021-23984  (opens in a new tab)
CWE-290  (opens in a new tab)

How to fix?

Upgrade Debian:12 firefox-esr to version 78.9.0esr-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream firefox-esr package and not the firefox-esr package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

A malicious extension could have opened a popup window lacking an address bar. The title of the popup lacking an address bar should not be fully controllable, but in this situation was. This could have been used to spoof a website and attempt to trick the user into providing credentials. This vulnerability affects Firefox ESR < 78.9, Firefox < 87, and Thunderbird < 78.9.

CVSS Scores

version 3.1