CVE-2021-23673: 
JavaScript vulnerability analysis and mitigation

This vulnerability (CVE-2021-23673) affects all versions of the pekeupload package, which is a jQuery plugin for file upload functionality. The vulnerability was disclosed on September 8, 2021, and published on October 24, 2021. The issue allows attackers to execute arbitrary JavaScript code through maliciously crafted filenames during file upload operations (Snyk).

The vulnerability is classified as a Cross-site Scripting (XSS) issue with a CVSS v3.1 base score of 6.1 (MEDIUM) according to NVD, and 5.4 (MEDIUM) according to Snyk. The vulnerability vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, indicating that it is network-accessible, requires low attack complexity, needs no privileges, but does require user interaction (NVD).

When successfully exploited, this vulnerability can lead to the execution of arbitrary JavaScript code in the context of the user's browser. This could potentially result in cookie theft, session hijacking, or other client-side attacks. The vulnerability affects both confidentiality and integrity with low impact, while having no direct impact on availability (Snyk).

The vulnerability is exploitable when an attacker can induce a user to upload a file with a name containing malicious JavaScript code. Snyk has published a proof-of-concept exploit demonstrating the vulnerability. The exploit involves creating a specially crafted file with JavaScript code in its filename, which gets executed when uploaded through the pekeupload interface (Snyk).

There is no fixed version available for the pekeupload package. As this is an unfixed vulnerability, users should consider implementing additional input validation for file names, using alternative file upload solutions, or implementing server-side filtering of potentially malicious filenames (Snyk).