CVE-2025-62024 is a cross-site scripting (XSS) vulnerability identified in the Jonathan Jernigan Pie Calendar software, specifically affecting versions up to 1.2.9. The root cause is improper neutralization of input during the generation of web pages, which allows malicious actors to inject and execute arbitrary scripts in the context of the affected web application. This vulnerability is classified as reflected or stored XSS depending on the input vector, enabling attackers to perform actions such as session hijacking, credential theft, or delivering malicious payloads to users. The CVSS v3.1 score of 6.5 indicates a medium severity level, with the vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L. This means the attack can be launched remotely over the network (AV:N) with low complexity (AC:L), requires low privileges (PR:L), and user interaction (UI:R). The scope is changed (S:C), indicating that the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality, integrity, and availability is limited but present (C:L/I:L/A:L). No patches or exploit code are currently publicly available, and no known exploitation in the wild has been reported. The vulnerability was published on October 22, 2025, with the initial reservation on October 7, 2025. The vendor has not yet released a patch, and no direct mitigation links are provided. This vulnerability is typical of web applications that fail to properly sanitize or encode user-supplied input before rendering it in HTML pages, a common vector for XSS attacks.

For European organizations using Jonathan Jernigan Pie Calendar, this vulnerability poses a moderate risk. Successful exploitation could lead to unauthorized script execution in users' browsers, potentially resulting in session hijacking, theft of sensitive information, or manipulation of calendar data. This could disrupt business operations, compromise user accounts, or facilitate further attacks such as phishing or malware delivery. The requirement for user interaction and low privileges reduces the likelihood of widespread automated exploitation but does not eliminate targeted attacks. Organizations in sectors with high reliance on calendar and scheduling tools—such as finance, healthcare, and government—may face increased risks. Additionally, the scope change in the vulnerability suggests that exploitation could affect multiple components or users beyond the initially targeted system, increasing potential damage. The absence of known exploits in the wild provides a window for proactive mitigation, but delayed patching could expose organizations to emerging threats. Overall, the impact is moderate but significant enough to warrant attention, especially in environments with sensitive or regulated data.

European organizations should implement the following specific mitigation strategies: 1) Monitor vendor communications closely and apply official patches or updates for Pie Calendar as soon as they become available to eliminate the vulnerability. 2) In the absence of patches, apply web application firewall (WAF) rules to detect and block suspicious input patterns that could exploit XSS vectors. 3) Conduct thorough input validation and output encoding on all user-supplied data within the application, ensuring that special characters are properly escaped before rendering in HTML. 4) Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS attacks. 5) Educate users about the risks of interacting with untrusted links or content within the calendar application to reduce successful exploitation via social engineering. 6) Regularly audit and review application logs for unusual activity indicative of attempted exploitation. 7) Consider isolating the Pie Calendar application within segmented network zones to limit lateral movement if compromised. These measures, combined with timely patching, will significantly reduce the risk posed by this vulnerability.