The NinjaTeam WP Telegram Chat Widget plugin for WordPress contains a stored cross-site scripting vulnerability (CWE-79) due to improper neutralization of input during web page generation. Specifically, the 'njtele_button' shortcode does not properly sanitize or escape user-supplied attributes, allowing authenticated users with contributor or higher privileges to inject malicious 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 affects all plugin versions up to 1.0. 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 impacts on confidentiality and integrity with no impact on availability. No patch or official fix has been documented yet.

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 affected pages, potentially compromising user sessions or performing unauthorized actions within the context of the victim's browser. The confidentiality and integrity of user data may be impacted. There is no known impact on system availability. No known exploits have been reported in the wild.

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 WP Telegram Chat Widget plugin if possible. Monitor for updates from the vendor for an official patch or mitigation steps.