Joomla Extension – getk2.com – Exposure of sensitive files via attachment copy in K2 extension for Joomla < 2.26_CVE-2026-48944
The K2 frontend article-save handler accepts an `attachment[N][existing]` POST field that is concatenated with `JPATH_SITE/` and passed to `JFile::copy()`. `JPath::clean` does NOT strip `..`, and there is no allow-list of source paths. An Author can therefore copy `configurati...