CVE-2026-22781

· CRITICALAnalyzed

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CVSS v3.1

9.8

CVSS v4.0

10.0

EPSS

2.21%

Published

Jan 12, 2026

Modified

Jan 16, 2026

Public PoC / Exploit

All weaponized →

No public PoC or exploit code indexed for this CVE.

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

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 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-78

Affected Products (1)

ritlabs · tinyweb (up to 1.98)vulnerable

References (3)

https://github.com/maximmasiutin/TinyWeb/commit/876b7e2887f4ea5be3e18bb2af7313f23a283c96

Patch

https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-m779-84h5-72q2

Third Party Advisory

https://www.masiutin.net/tinyweb-cve-2025-cgi-command-injection.html

Third Party Advisory

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