The Kredeum NFTs WordPress plugin (versions up to 1.6.9) contains a stored cross-site scripting vulnerability (CWE-79) in its 'kredeum_opensky' shortcode. This vulnerability arises from improper neutralization of input during web page generation, specifically insufficient sanitization and escaping of user-supplied shortcode attributes. Authenticated attackers with contributor or higher privileges can exploit this to inject arbitrary JavaScript that executes in the context of users viewing the infected pages, potentially leading to session hijacking or other script-based attacks. The CVSS 3.1 base score is 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N), reflecting network attack vector, low attack complexity, required privileges, no user interaction, scope change, and limited confidentiality and integrity impact.

Successful exploitation allows authenticated users with contributor-level or higher privileges to inject persistent malicious scripts into pages via the vulnerable shortcode. These scripts execute in the browsers of users who visit the infected pages, potentially compromising user sessions and data confidentiality and integrity. The vulnerability does not impact availability. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict contributor-level access to trusted users only and consider disabling or removing the Kredeum NFTs plugin if possible to prevent exploitation.