CVE-2026-107864: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Igor Funa Ad Inserter

The Igor Funa Ad Inserter plugin suffers from a stored cross-site scripting vulnerability due to improper input neutralization during web page generation. This flaw allows attackers with at least low privileges and requiring user interaction to inject malicious scripts that can execute in the context of affected users' browsers. The vulnerability affects all versions from initial release through 2.8.18. The CVSS 3.1 vector indicates network attack vector, low attack complexity, low privileges required, user interaction required, and scope change, with impacts on confidentiality, integrity, and availability.

Successful exploitation of this vulnerability can lead to execution of arbitrary scripts in the context of the affected web application, potentially resulting in data disclosure, modification, or disruption of service. The vulnerability requires user interaction and low privileges, which limits but does not eliminate risk. The scope change in the CVSS vector indicates that the vulnerability can affect resources beyond the initially vulnerable component.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider restricting privileges of users who can input data into the plugin and apply web application firewall (WAF) rules to detect and block malicious payloads related to stored XSS. Monitor vendor communications for updates on patches.