What’s Vulnerable › Vulnerabilities

CVE-2026-22781: TinyWeb CGI Command Injection

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-12 · updated 2026-06-17
• Weakness: CWE-78

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

• maximmasiutin TinyWeb: before 1.98 — fixed in 1.98

How to fix

Upgrade to a fixed version: maximmasiutin TinyWeb 1.98. Check the vendor advisory for mitigations.

References

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

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