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CVE-2026-22781

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Date: January 12, 2026

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.

Severity Score

Related Resources (5)

https://github.com/maximmasiutin/TinyWeb/commit/876b7e2887f4ea5be3e18bb2af7313f23a283c96
https://www.masiutin.net/tinyweb-cve-2025-cgi-command-injection.html
https://nvd.nist.gov/vuln/detail/CVE-2026-22781
https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-m779-84h5-72q2
https://www.mend.io/vulnerability-database/CVE-2026-22781

Severity Score

Weakness Type (CWE)

Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CWE-78

Top Fix

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Upgrade Version

Upgrade to version https://github.com/maximmasiutin/TinyWeb.git - v1.98;https://github.com/maximmasiutin/TinyWeb.git - v1.98

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): CHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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