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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.

CVE-2023-4581 is a security vulnerability identified in Mozilla Firefox and Thunderbird related to the handling of Excel .xll add-in files. Firefox maintains an executable blocklist to prevent users from downloading potentially harmful executable files without warning. However, .xll files, which are executable add-ins for Microsoft Excel, were not included in this blocklist. This omission allowed these files to be downloaded freely without any browser warning, increasing the risk of users inadvertently downloading malicious code embedded in such files. The vulnerability affects Firefox versions earlier than 117, Firefox ESR versions earlier than 102.15 and 115.2, and Thunderbird versions earlier than 102.15 and 115.2. While no active exploits have been reported, the risk lies in social engineering attacks where users could be tricked into downloading and executing malicious .xll files, potentially leading to malware infection or unauthorized code execution. The vulnerability does not directly allow remote code execution via the browser itself but lowers the barrier for malware delivery by bypassing browser warnings. The lack of a CVSS score indicates that the vulnerability is recognized but not yet fully assessed in terms of impact metrics. Mozilla has addressed this issue in subsequent updates by adding .xll files to the executable blocklist, preventing their silent download. Users running affected versions should upgrade promptly to mitigate this risk.

Detailed information about CVE-2023-4581: Vulnerability in Mozilla Firefox affecting Mozilla Firefox. Get real-time updates, technical details, and mitigation s

CVE-2023-4581: Vulnerability in Mozilla Firefox - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2023-4581: Vulnerability in Mozilla Firefox

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