CVE-2023-6838: 
WSO2 API Manager vulnerability analysis and mitigation

A Reflected Cross-Site Scripting (XSS) vulnerability (CVE-2023-6838) was discovered in the Authentication Endpoint of multiple WSO2 products. The vulnerability affects WSO2 API Manager versions 3.1.0 and 3.2.0, WSO2 Identity Server version 5.10.0, and WSO2 IS as Key Manager version 5.10.0. The vulnerability was disclosed on December 15, 2023, and received a CVSS v3.1 base score of 6.1 (Medium) (NVD, WSO2 Advisory).

The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation). It can be exploited by tampering with a request parameter in the Authentication Endpoint, and the attack can be performed through both authenticated and unauthenticated requests. The vulnerability has a CVSS vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N, indicating network accessibility, low attack complexity, no privileges required, and user interaction required (NVD).

The exploitation of this vulnerability could allow attackers to redirect browsers to malicious websites, modify web page UI elements, and retrieve information from the browser. However, session hijacking attacks are prevented as all session-related sensitive cookies are protected with the httpOnly flag (WSO2 Advisory).

Organizations using affected versions should either upgrade to the latest version of the WSO2 product if it's not listed in the affected products list, or apply the security fix available at https://github.com/wso2/identity-apps/pull/1459. WSO2 customers with support subscriptions are advised to use WSO2 Updates to apply the fix (WSO2 Advisory).