CVE-2026-81300: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in silverplugins217 Calculation For Contact Form 7

This vulnerability (CVE-2026-81300) is an instance of CWE-79, improper neutralization of input during web page generation, leading to Cross-Site Scripting (XSS) in the Calculation For Contact Form 7 plugin by silverplugins217. It affects unauthenticated users in versions up to and including 1.0. The CVSS 3.1 base score is 7.1, reflecting network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and impacts on confidentiality, integrity, and availability. No patch or official remediation level has been published as of the data provided.

Successful exploitation could allow an unauthenticated attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to partial loss of confidentiality, integrity, and availability of the affected system. This could result in unauthorized actions performed on behalf of legitimate users or data exposure. However, 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 released, consider applying temporary mitigations such as disabling or restricting the vulnerable plugin if feasible. Monitor vendor channels for updates.