{"id":"CVE-2023-4581","state":"PUBLISHED","title":"XLL file extensions were downloadable without warnings","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.","publishedAt":"2023-09-11T08:01:45.092Z","updatedAt":"2025-12-18T15:23:06.218Z","severity":null,"assigner":"mozilla","products":["Mozilla Firefox","Mozilla Firefox ESR","Mozilla Thunderbird"],"affected":[{"vendor":"Mozilla","product":"Firefox","versions":[{"version":"unspecified","status":"affected","lessThan":"117","versionType":"custom"}]},{"vendor":"Mozilla","product":"Firefox ESR","versions":[{"version":"unspecified","status":"affected","lessThan":"102.15","versionType":"custom"}]},{"vendor":"Mozilla","product":"Firefox ESR","versions":[{"version":"unspecified","status":"affected","lessThan":"115.2","versionType":"custom"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"unspecified","status":"affected","lessThan":"102.15","versionType":"custom"}]},{"vendor":"Mozilla","product":"Thunderbird","versions":[{"version":"unspecified","status":"affected","lessThan":"115.2","versionType":"custom"}]}],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=1843758","https://www.mozilla.org/security/advisories/mfsa2023-34/","https://www.mozilla.org/security/advisories/mfsa2023-35/","https://www.mozilla.org/security/advisories/mfsa2023-36/","https://www.mozilla.org/security/advisories/mfsa2023-37/","https://www.mozilla.org/security/advisories/mfsa2023-38/"],"weaknesses":[],"ingestedAt":"2026-10-29T20:06:33.064Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/4xxx/CVE-2023-4581.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2023-4581","state":"PUBLISHED","datePublished":"2023-09-11T08:01:45.092Z","dateUpdated":"2025-12-18T15:23:06.218Z","assignerShortName":"mozilla","assignerOrgId":"f16b083a-5664-49f3-a51e-8d479e5ed7fe","dateReserved":"2023-08-29T03:36:56.674Z"},"containers":{"cna":{"title":"XLL file extensions were downloadable without warnings","descriptions":[{"lang":"en","value":"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. 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