This vulnerability arises from improper neutralization of input during web page generation in the Go standard library's html/template package. Specifically, when a <script> tag has an empty or whitespace-only 'type' attribute, the template engine fails to properly escape data inside the script block. This can enable cross-site scripting (CWE-79) attacks if untrusted data is injected into such templates. The issue affects all versions up to and including 1.26.0-0. No official fix or mitigation has been released by the vendor as of the publication date.

Successful exploitation could allow an attacker to inject malicious scripts into web pages generated by the vulnerable html/template package, potentially leading to partial confidentiality and integrity loss of user data within the affected application context. The CVSS score of 6.1 reflects a medium severity with network attack vector, low attack complexity, no privileges required, user interaction required, and scope change. There are no known exploits in the wild at this time.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, users should avoid including <script> tags with empty or whitespace-only 'type' attributes in templates that process untrusted data. Careful review and sanitization of template inputs is recommended to reduce risk.