The Inline Stock Quotes plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, the plugin fails to adequately sanitize and escape user-supplied attributes in its stock shortcode, allowing authenticated users with contributor or higher privileges to inject arbitrary JavaScript code. This malicious code executes in the context of any user who views the compromised page, potentially leading to session hijacking or other client-side attacks. The vulnerability affects all versions up to and including 0.2. No known exploits are reported in the wild, and no patch or remediation has been provided by the vendor as of the publication date.

An attacker with contributor-level access or higher can 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 or performing unauthorized actions within the context of the affected site. The vulnerability does not impact availability but can lead to confidentiality and integrity loss of user data. The CVSS score of 6.4 reflects a medium severity with network attack vector, low attack complexity, and no user interaction required.

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 Inline Stock Quotes plugin to prevent exploitation. Monitor for updates from the vendor or security advisories for a patch or official mitigation.