Vulnerabilities in Szafir software

CERT Polska has received a report about vulnerabilities in Szafir software and participated in coordination of their disclosure.

The vulnerabilityCVE-2026-93570: Szafir and Szafir Weryfikująca are vulnerable to XML External Entity (XXE) injection. When a user signs or verify a crafted XML file containing aDOCTYPEwith an external DTD reference, the parser processes external entities, allowing an attacker to read arbitrary files from the victim's filesystem.

This issue was fixed in Szafir version 2.0 build 708. Szafir Weryfikująca is no longer supported (End of Life) and has not been fixed.

The vulnerabilityCVE-2026-93571: Szafir is vulnerable to Path Traversal in the uploaded filename. A man-in-the-middle attacker who can reroute update request to their server can prepare arbitrary XML file that will be saved in location chosen by attacker.

The vulnerabilityCVE-2026-106036: Szafir accepts any client or server certificate without performing certificate and hostname validation, allowing HTTPS connections without authenticating the remote server. An attacker can provide an arbitrary SSL/TLS certificate and cause the application to download an update file from their server.

These issues were fixed in version 2.0 build 708.

We thank Mikus Teivens from Critical Security for the responsible vulnerability report.