CVE-2023-5727

The executable file warning was not presented when downloading .msix, .msixbundle, .appx, and .appxbundle files, which can run commands on a user's computer. *Note: This issue only affected Windows operating systems. Other operating systems are unaffected.* This vulnerability affects Firefox < 119, Firefox ESR < 115.4, and Thunderbird < 115.4.1.

• https://bugzilla.mozilla.org/show_bug.cgi?id=1847180Issue Tracking, Permissions Required, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2023-45/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2023-46/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2023-47/Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1847180Issue Tracking, Permissions Required, Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2023-45/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2023-46/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2023-47/Vendor Advisory

Published

Oct 25, 2023

Last Modified

Jun 17, 2026

Status

Modified

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