CVE-2023-4583

Browsing Context potentially not cleared when closing Private Window

Published Sep 11, 2023 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
When checking if the Browsing Context had been discarded in `HttpBaseChannel`, if the load group was not available then it was assumed to have already been discarded which was not always the case for private channels after the private session had ended. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2023-54437 When checking if the Browsing Context had been discarded in `HttpBaseChannel`, if the load group was not available then it was assumed to have already been discarded which was not always the case for private channels after the private session had ended. This vulnerability affects Firefox < 117, Firefox ESR < 115.2, and Thunderbird < 115.2.
Ubuntu USN Ubuntu USN USN-6320-1 Firefox vulnerabilities
Ubuntu USN Ubuntu USN USN-6405-1 Thunderbird vulnerabilities
History
Type Values Removed Values Added
Title Mozilla: Browsing Context potentially not cleared when closing Private Window Browsing Context potentially not cleared when closing Private Window
Type Values Removed Values Added
Weaknesses CWE-754
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Sources

Status
PUBLISHED
Assigner
mozilla
Published
Updated
Dec 18, 2025, 3:23 PM
Reserved
Aug 29, 2023, 3:37 AM
Status
Modified
Published
Sep 11, 2023, 9:15 AM
Modified
Jun 17, 2026, 6:38 AM
Severity
Low
Public date
Aug 29, 2023, 12:00 AM