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.
References (6)
Core 6
Core References
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-36/
Issue Tracking, Permissions Required
https://bugzilla.mozilla.org/show_bug.cgi?id=1843758
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-34/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-35/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-37/
Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2023-38/
Scores
CVSS v3
4.3
EPSS
0.0016
EPSS Percentile
36.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
Status
published
Products (3)
mozilla/firefox
< 117.0
mozilla/firefox_esr
< 102.15
mozilla/thunderbird
< 115.2
Published
Sep 11, 2023
Tracked Since
Feb 18, 2026