CVE-2024-31103

Vulnerability

Kanban Boards for WordPress versions 2.5.21 and earlier contain a reflected Cross-site Scripting (XSS) vulnerability due to improper neutralization of user-supplied input during web page generation [1]. The flaw resides in a parameter or endpoint where unsanitized query string values are echoed back to the page, requiring no special configuration beyond having the plugin active. Affected versions: from n/a through 2.5.21.

Exploitation

An unauthenticated attacker can craft a malicious URL containing a JavaScript payload in a vulnerable parameter. The victim must be tricked into clicking the crafted link (e.g., via email, social engineering, or a redirect) while logged into a WordPress admin session or browsing the affected page. No authentication or special privileges are required for the attacker; the exploit succeeds when the victim’s browser loads the link, executing the injected script in the context of the WordPress site.

Impact

Successful exploitation allows the attacker to execute arbitrary JavaScript in the victim’s browser within the affected WordPress site. This can lead to session hijacking, defacement, theft of authentication cookies, or redirection to malicious sites. The attack does not grant server-side control but can compromise victim accounts and expose sensitive information [1].

Mitigation

The plugin has been closed and removed from the WordPress.org plugin directory as of March 7, 2024 due to a security issue [1]. No patched version is available or being distributed. Users are strongly advised to uninstall the plugin immediately. If the functionality is critical, migrate to an alternative Kanban plugin that is actively maintained. No workaround is provided; the only mitigation is removal of the plugin [1].