CVE-2020-14173: 
JIRA vulnerability analysis and mitigation

The vulnerability (CVE-2020-14173) is a cross-site scripting (XSS) vulnerability in Atlassian Jira Server and Data Center's file upload feature. The vulnerability was discovered in March 2020 and affects multiple versions of the software: versions before 8.5.4, versions 8.6.0 to 8.6.2, and versions 8.7.0 to 8.7.1. This security flaw allows remote attackers to inject arbitrary HTML or JavaScript through the file upload functionality (Atlassian Advisory, NVD Database).

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation). It received a CVSS v3.1 base score of 5.4 (Medium severity) with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. Under CVSS v2.0, it scored 3.5 (Low severity) with the vector string (AV:N/AC:M/Au:S/C:N/I:P/A:N). The vulnerability requires user interaction and affects the confidentiality and integrity of the system, but not its availability (NVD Database).

When exploited, this vulnerability allows attackers to inject malicious HTML or JavaScript code through the file upload feature, potentially leading to unauthorized access to sensitive information and the ability to perform actions on behalf of other users. The cross-site scripting vulnerability could result in session hijacking, defacement of the Jira interface, or other malicious actions within the context of the affected Jira instance (NVD Database).

The vulnerability requires an attacker to have low privileges and user interaction for successful exploitation. The attack complexity is considered low, indicating that the vulnerability is relatively straightforward to exploit once the necessary conditions are met (NVD Database).

Atlassian has released fixed versions to address this vulnerability. Users should upgrade to version 8.5.4 if running version 8.5.x, version 8.6.2 if running version 8.6.x, or version 8.7.1 if running version 8.7.x. The fix was also included in version 8.8.0 (Atlassian Advisory).