CVE-2026-48944: Joomlaworks k2

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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 `configuration.php` (or any other file readable by the web user — including `../../../etc/passwd`) into `/media/k2/attachments/`, then retrieve the contents via the K2 attachment-download endpoint.

Affected products

• Joomlaworks k2: up to and including 2.26

Published 2026-06-25. Last modified 2026-06-28.