The black fade animation when exiting fullscreen is roughly the length of the anti-clickjacking delay on permission prompts. It was possible to use this fact to surprise users by luring them to click where the permission grant button would be about to appear. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-3661-1 firefox-esr security update
Debian DLA Debian DLA DLA-3674-1 thunderbird security update
Debian DSA Debian DSA DSA-5561-1 firefox-esr security update
Debian DSA Debian DSA DSA-5566-1 thunderbird security update
EUVD EUVD EUVD-2023-58453 The black fade animation when exiting fullscreen is roughly the length of the anti-clickjacking delay on permission prompts. It was possible to use this fact to surprise users by luring them to click where the permission grant button would be about to appear. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.
Ubuntu USN Ubuntu USN USN-6509-1 Firefox vulnerabilities
Ubuntu USN Ubuntu USN USN-6515-1 Thunderbird vulnerabilities
Fixes

Solution

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Workaround

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2025-02-13T17:26:10.493Z

Reserved: 2023-11-20T13:33:29.870Z

Link: CVE-2023-6206

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2023-11-21T15:15:07.787

Modified: 2024-11-21T08:43:22.127

Link: CVE-2023-6206

cve-icon Redhat

Severity : Important

Publid Date: 2023-11-21T00:00:00Z

Links: CVE-2023-6206 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses