CVE-2026-4353 is a stored cross-site scripting vulnerability in the CI HUB Connector WordPress plugin. It occurs due to improper neutralization of input in the 'id' attribute of the cihub_metadata shortcode, allowing authenticated users with Contributor or higher privileges to inject arbitrary scripts. These scripts execute in the context of users who access the injected pages, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all plugin versions up to 1.2.106. 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 availability impact. No vendor advisory or patch is currently provided.

An authenticated attacker with Contributor-level or higher access can inject persistent malicious scripts into pages via the vulnerable shortcode attribute. These scripts execute in the browsers of users who view the compromised pages, potentially leading to unauthorized actions such as session hijacking or data manipulation. The impact is limited to confidentiality and integrity, with no direct availability impact. The vulnerability requires authenticated access, reducing the attack surface compared to unauthenticated XSS.

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 removing or disabling the CI HUB Connector plugin if possible. Implementing web application firewall (WAF) rules to detect and block malicious script payloads in shortcode attributes may provide temporary mitigation.