A mishandled security check when creating a WebSocket in a WebWorker caused the Content Security Policy connect-src header to be ignored. This could lead to connections to restricted origins from inside WebWorkers. This vulnerability affects Firefox < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-3275-1 firefox-esr security update
Debian DLA Debian DLA DLA-3324-1 thunderbird security update
Debian DSA Debian DSA DSA-5322-1 firefox-esr security update
Debian DSA Debian DSA DSA-5355-1 thunderbird security update
EUVD EUVD EUVD-2023-27702 A mishandled security check when creating a WebSocket in a WebWorker caused the Content Security Policy connect-src header to be ignored. This could lead to connections to restricted origins from inside WebWorkers. This vulnerability affects Firefox < 109, Thunderbird < 102.7, and Firefox ESR < 102.7.
Ubuntu USN Ubuntu USN USN-5816-1 Firefox vulnerabilities
Ubuntu USN Ubuntu USN USN-5824-1 Thunderbird vulnerabilities
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 18 Dec 2025 15:30:00 +0000

Type Values Removed Values Added
Description A mishandled security check when creating a WebSocket in a WebWorker caused the Content Security Policy connect-src header to be ignored. This could lead to connections to restricted origins from inside WebWorkers. This vulnerability affects Firefox < 109, Thunderbird < 102.7, and Firefox ESR < 102.7. A mishandled security check when creating a WebSocket in a WebWorker caused the Content Security Policy connect-src header to be ignored. This could lead to connections to restricted origins from inside WebWorkers. This vulnerability affects Firefox < 109, Firefox ESR < 102.7, and Thunderbird < 102.7.
Title Mozilla: Content Security Policy wasn't being correctly applied to WebSockets in WebWorkers Content Security Policy wasn't being correctly applied to WebSockets in WebWorkers

Fri, 10 Jan 2025 19:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2025-12-18T15:22:56.025Z

Reserved: 2023-01-16T00:00:00

Link: CVE-2023-23602

cve-icon Vulnrichment

Updated: 2024-08-02T10:35:33.382Z

cve-icon NVD

Status : Modified

Published: 2023-06-02T17:15:10.777

Modified: 2025-12-18T16:15:48.760

Link: CVE-2023-23602

cve-icon Redhat

Severity : Moderate

Publid Date: 2023-01-17T00:00:00Z

Links: CVE-2023-23602 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses