CVE-2023-4581

XLL file extensions were downloadable without warnings

Published Sep 11, 2023 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Description
Excel `.xll` add-in files did not have a blocklist entry in Firefox's executable blocklist which allowed them to be downloaded without any warning of their potential harm. This vulnerability affects Firefox < 117, Firefox ESR < 102.15, Firefox ESR < 115.2, Thunderbird < 102.15, and Thunderbird < 115.2.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-3553-1 firefox-esr security update
Debian DLA Debian DLA DLA-3554-1 thunderbird security update
Debian DSA Debian DSA DSA-5485-1 firefox-esr security update
Debian DSA Debian DSA DSA-5488-1 thunderbird security update
EUVD EUVD EUVD-2023-54435 Excel `.xll` add-in files did not have a blocklist entry in Firefox's executable blocklist which allowed them to be downloaded without any warning of their potential harm. This vulnerability affects Firefox < 117, Firefox ESR < 102.15, Firefox ESR < 115.2, Thunderbird < 102.15, and Thunderbird < 115.2.
Ubuntu USN Ubuntu USN USN-6320-1 Firefox vulnerabilities
Ubuntu USN Ubuntu USN USN-6368-1 Thunderbird vulnerabilities
History
Type Values Removed Values Added
Title Mozilla: XLL file extensions were downloadable without warnings XLL file extensions were downloadable without warnings
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', '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, 3:36 AM
Status
Modified
Published
Sep 11, 2023, 9:15 AM
Modified
Jun 17, 2026, 6:38 AM
Severity
Moderate
Public date
Aug 29, 2023, 12:00 AM