CVE-2021-25024: 
WordPress vulnerability analysis and mitigation

The EventCalendar WordPress plugin before version 1.1.51 contains a Reflected Cross-Site Scripting (XSS) vulnerability identified as CVE-2021-25024. The vulnerability was discovered by Krzysztof Zając and publicly disclosed on December 20, 2021. This security issue affects the event-calendar-wd plugin for WordPress installations (WPScan).

The vulnerability stems from improper input validation where the plugin fails to properly escape user input before outputting it back in attributes. The vulnerability has been assigned a CVSS v3.1 base score of 6.1 (Medium) with the vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N. It is classified as CWE-79: Improper Neutralization of Input During Web Page Generation (NVD).

When exploited, this vulnerability could allow attackers to execute cross-site scripting attacks against users who interact with specially crafted URLs. The impact is particularly concerning in the WordPress admin dashboard where privileged users might be targeted (WPScan).

The vulnerability has been fixed in version 1.1.51 of the EventCalendar plugin. Users are advised to update to this version or later to mitigate the security risk (WPScan).