Command injection fixed in Estonia’s national eID software
DigiDoc4 — Estonia’s official eID signing client
DigiDoc4’s file-manager integration built shell commands by pasting filenames straight into a command line. A file named with shell metacharacters would run arbitrary code the instant a citizen right-clicked it to sign or encrypt — no prompt, no warning. On a client used daily for legally-binding signatures across an entire country, that is as serious as it gets.