Critical 10.0Published Jan 12, 2026

CVE-2026-22781TinyWeb CGI Command Injection

Updated under an hour ago (Oct 27, 2026, 10:00 PM ET)

Does this affect you?

It affects maximmasiutin TinyWeb and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for maximmasiutin TinyWeb

Exploited in the last 30 days

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: 10.0 CRITICAL (v4.0, CNA)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
Weakness (CWE): CWE-78
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jan 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

maximmasiutin TinyWeb maximmasiutin:tinyweb (from the name)	before 1.98	CNA record
ritlabs tinyweb ritlabs:tinyweb	before 1.98	NVD

References

References

https://github.com/maximmasiutin/TinyWeb/security/advisories/GHSA-m779-84h5-72q2	x-refsource-confirm, third-party-advisory
https://github.com/maximmasiutin/TinyWeb/commit/876b7e2887f4ea5be3e18bb2af7313f23a283c96	x-refsource-misc, patch
https://www.masiutin.net/tinyweb-cve-2025-cgi-command-injection.html	x-refsource-misc, third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.