CVE-2024-48535 is a stored cross-site scripting (XSS) vulnerability affecting eSoft Planner version 3.24.08271-USA. The vulnerability arises from insufficient input sanitization of the Name parameter, allowing attackers to inject crafted HTML or JavaScript payloads that are stored persistently on the server. When other users access the affected page or functionality, the malicious script executes in their browsers under the context of the vulnerable application. This can lead to theft of session cookies, user impersonation, or manipulation of displayed content, compromising confidentiality and integrity. The attack vector requires network access, low attack complexity, and privileges to submit data (PR:L), with user interaction needed to trigger the payload execution (UI:R). The vulnerability affects the confidentiality and integrity of user data but does not impact availability. The CVSS 3.1 base score is 6.1, reflecting medium severity. No patches or known exploits are currently available, indicating the need for proactive mitigation. The CWE-79 classification confirms this is a classic stored XSS issue, a common web application security flaw. Organizations running eSoft Planner should conduct thorough input validation and output encoding, implement Content Security Policy (CSP), and monitor for suspicious activity to reduce risk.

The primary impact of CVE-2024-48535 is on the confidentiality and integrity of user data within eSoft Planner environments. Successful exploitation could allow attackers to hijack user sessions, steal sensitive information, or alter displayed content, potentially leading to unauthorized access or misinformation. Although availability is not directly affected, the trustworthiness of the application and user confidence could be severely undermined. Organizations relying on eSoft Planner for planning and scheduling may face operational disruptions if users are compromised or data integrity is questioned. The requirement for some level of privilege to inject the payload limits the attack surface but does not eliminate risk, especially in environments with many users or weak internal controls. The absence of known exploits suggests a window for remediation before widespread attacks occur, but also means defenders must be vigilant. Overall, the vulnerability poses a moderate risk to organizations, particularly those with sensitive or regulated data handled via eSoft Planner.

To mitigate CVE-2024-48535, organizations should implement strict input validation on the Name parameter to reject or sanitize any HTML or script content before storage. Employing context-aware output encoding when rendering user-supplied data in web pages is critical to prevent script execution. Deploying a robust Content Security Policy (CSP) can further restrict the execution of unauthorized scripts. Access controls should be reviewed to minimize the number of users who can submit data that is stored and displayed to others. Regular security audits and code reviews focusing on input handling can identify similar issues proactively. Monitoring web application logs for unusual input patterns or error messages may help detect attempted exploitation. Until an official patch is released, consider applying virtual patching via web application firewalls (WAFs) configured to detect and block XSS payloads targeting the Name parameter. User awareness training about phishing and suspicious links can reduce the risk of triggering malicious scripts. Finally, maintain an incident response plan to quickly address any detected exploitation attempts.