CVE-2024-13581 is a stored cross-site scripting vulnerability in the Simple Charts plugin for WordPress (versions up to and including 1.0). The issue arises from improper neutralization of user-supplied input in the 'simple_chart' shortcode, allowing authenticated users with contributor-level access or higher to inject arbitrary web scripts. These scripts execute in the context of any user who accesses the injected page, potentially leading to session hijacking or other script-based attacks. The vulnerability is classified under CWE-79 and has a CVSS 3.1 base score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N). There is no indication of known exploits in the wild or an available patch at this time.

An attacker with contributor-level or higher privileges can inject persistent malicious scripts into pages via the vulnerable shortcode. These scripts execute in the browsers of users who view the compromised pages, potentially leading to partial confidentiality and integrity impacts such as session token theft or content manipulation. Availability is not affected. The vulnerability requires authenticated access and low attack complexity.

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