CVE-2026-5090

Description

Template::Plugin::HTML versions through 3.102 for Perl allows HTML and JavaScript to be injected. The html_filter function did not escape single quotes. HTML attributes inside of single quotes could be have code injected. For example, the variable -var- in <a id=-ref- title=-[% var | html %]-> would not be properly escaped. An attacker could insert some limited HTML and JavaScript, for example, var = - - onclick=-while (true) { alert(1) }-- Note that arbitrary HTML and JavaScript would be difficult to inject, because angle brackets, ampersands and double-quotes would still be escaped.