CVE-2026-22781: Ritlabs Tinyweb

Critical severity, CVSS 9.8. EPSS: 2.4% chance of exploitation in the next 30 days.

TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. TinyWeb HTTP Server before version 1.98 is vulnerable to OS command injection via CGI ISINDEX-style query parameters. The query parameters are passed as command-line arguments to the CGI executable via Windows CreateProcess(). An unauthenticated remote attacker can execute arbitrary commands on the server by injecting Windows shell metacharacters into HTTP requests. This vulnerability is fixed in 1.98.

Affected products

• Ritlabs Tinyweb: before 1.98 (fixed in 1.98)

Published 2026-01-12. Last modified 2026-06-17.