Vulnerability · Published Jan 12, 2026 · Assigned by GitHub_M

CVE-2026-22781TinyWeb CGI Command Injection

Critical 10.0

In plain English

A critical-severity OS command injection in TinyWeb from maximmasiutin. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.4% (higher than 84% of all known vulnerabilities).

Severity (CVSS 4.0)10.0Critical

Exploit odds (30 days)2.4%top 15.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
maximmasiutin	TinyWeb	< 1.98

Weakness: CWE-78 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References

https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-m779-84h5-72q2 x_refsource_CONFIRM
https://github.com/maximmasiutin/TinyWeb/commit/876b7e2887f4ea5be3e18bb2af7313f23a283c96 x_refsource_MISC
https://www.masiutin.net/tinyweb-cve-2025-cgi-command-injection.html x_refsource_MISC