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CVE-2026-22781

Ritlabs Tinyweb command injection

9.8 CRITICALEPSS 2.44%
  1. Published12 Jan 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Ritlabs Tinyweb< 1.98

Remediation

Fixed in
Ritlabs Tinyweb≥ 1.98

References

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Frequently asked

Is CVE-2026-22781 being actively exploited?

CVE-2026-22781 is not in the CISA KEV catalog. Its EPSS exploit probability is 2.44%.

How severe is CVE-2026-22781?

CVE-2026-22781 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 2.44% probability of exploitation.

Which products are affected by CVE-2026-22781?

Affected products include Ritlabs Tinyweb.

How do I fix CVE-2026-22781?

Upgrade affected software to a fixed version, for example Ritlabs Tinyweb 1.98 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-22781 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.