CVE-2026-4303 is a stored cross-site scripting vulnerability in the WP Visitor Statistics (Real Time Traffic) plugin for WordPress. The issue arises from improper neutralization of input in the 'wsm_showDayStatsGraph' shortcode, allowing authenticated contributors or higher to inject arbitrary scripts. These scripts execute in the context of users viewing the infected pages, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all plugin versions up to 8.4. There is no vendor advisory or patch information currently available.

An attacker with contributor-level or higher access can inject persistent malicious scripts into pages via the vulnerable shortcode. These scripts execute in the browsers of users who visit the compromised pages, potentially leading to information disclosure or user session compromise. The vulnerability does not affect availability but impacts confidentiality and integrity to a limited extent. No known exploits in the wild have been reported.

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 vulnerable plugin if feasible. Monitor for updates from the vendor regarding patches or official mitigations.