Security Advisory

CVE-2026-48944

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-25 15:24:45

Last updated 2026-06-28 18:37:04

Assigner Joomla

CVSS score not scored

State PUBLISHED

Description

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.

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