The Team Section Block plugin for WordPress suffers from a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, user-supplied social network link URLs are not properly sanitized or escaped, allowing authenticated users with Contributor or higher privileges to inject arbitrary scripts. These scripts execute in the context of any user who views the compromised page, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all plugin versions up to 2.0.0. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, required privileges at the contributor level, no user interaction, and partial confidentiality and integrity impact without availability impact. No patch or official fix has been documented yet.

An attacker with Contributor-level or higher access can inject persistent malicious scripts into pages via social network link URLs. These scripts execute in the browsers of users who view the infected pages, potentially compromising user sessions or performing unauthorized actions within the context of the affected site. The impact is limited to confidentiality and integrity, with no direct availability impact reported. Since the vulnerability requires authenticated access, the risk is mitigated somewhat by access controls but remains significant within trusted user roles.

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. Consider removing or disabling the Team Section Block plugin if feasible. Employ web application firewalls or security plugins that can detect and block XSS payloads as a temporary mitigation.