CVE-2024-27140: 
Java vulnerability analysis and mitigation

A Cross-site Scripting (XSS) vulnerability has been identified in Apache Archiva, tracked as CVE-2024-27140. The vulnerability affects Apache Archiva versions 2.0.0 and later. This is a reflected XSS vulnerability that stems from improper neutralization of input during web page generation. The issue was discovered by multiple security researchers including Sandro Bauer, Ben Tullis, Scott Bassett, and L0ne1y (OSS Security).

The vulnerability is classified as an Improper Neutralization of Input During Web Page Generation (CWE-79) issue. According to the CISA Automated Directive Program assessment, it has received a CVSS v3.1 base score of 5.4 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N (NVD).

The vulnerability could allow attackers to execute cross-site scripting attacks against users of the affected Apache Archiva installations. As this is a reflected XSS vulnerability, it could potentially lead to the theft of user session tokens, cookies, or other sensitive information handled by the affected application (OSS Security).

The vulnerability requires low attack complexity and user interaction for successful exploitation. An attacker would need to craft specific URLs containing malicious characters to trigger the XSS condition (NVD).

As Apache Archiva is now retired, no official patch will be released to address this vulnerability. Users are recommended to either find an alternative solution or implement one of two workarounds: 1) restrict access to the Archiva instance to trusted users only, or 2) configure an HTTP proxy in front of the Archiva instance to filter requests containing malicious characters in the URL (OSS Security).