CVE-2023-23956: 
SiteMinder Web Agent vulnerability analysis and mitigation

CVE-2023-23956 is a cross-site scripting (XSS) vulnerability affecting Symantec SiteMinder WebAgent version 12.52. The vulnerability was discovered and initially published on May 27, 2023. This security flaw allows attackers to supply malicious HTML and JavaScript code that can be executed in the client browser (Vendor Advisory).

The vulnerability has been assigned 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. The attack occurs when a malicious URL is presented to users, and upon clicking, the application returns a display that includes input characters along with an error message about bad parameters on the query string. This display can lead to unwanted script execution in the browser (Vendor Advisory).

When exploited, this vulnerability allows attackers to execute malicious HTML and JavaScript code in the client's browser. The impact is rated as having low confidentiality and integrity impact, with no availability impact. The attack requires user interaction and can potentially lead to unauthorized script execution in the user's browser context (Vendor Advisory).

Broadcom has provided mitigation guidelines for customers to prevent cross-site scripting attacks. Users are advised to follow the documented guidelines available in the technical documentation. The specific mitigation steps can be found at the Broadcom technical documentation portal (Vendor Advisory).

The vulnerability was discovered and reported by security researcher Harshit Joshi (Vendor Advisory).