A security issue was found in Firefox before version 87 and Thunderbird before version 78.9. 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.
A security issue was found in Firefox before version 87 and Thunderbird before version 78.9. 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.
https://www.mozilla.org/en-US/security/advisories/mfsa2021-10/#CVE-2021-23984 https://www.mozilla.org/en-US/security/advisories/mfsa2021-12/#CVE-2021-23984 https://bugzilla.mozilla.org/show_bug.cgi?id=1693664
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