Vulnerability Description
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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ritlabs | Tinyweb | < 1.98 |
Related Weaknesses (CWE)
References
- https://github.com/maximmasiutin/TinyWeb/commit/876b7e2887f4ea5be3e18bb2af7313f2Patch
- https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-m779-84h5-72q2Third Party Advisory
- https://www.masiutin.net/tinyweb-cve-2025-cgi-command-injection.htmlThird Party Advisory
FAQ
What is CVE-2026-22781?
CVE-2026-22781 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 param...
How severe is CVE-2026-22781?
CVE-2026-22781 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-22781?
Check the references section above for vendor advisories and patch information. Affected products include: Ritlabs Tinyweb.