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CVE-2026-27613

Ritlabs Tinyweb remote code execution

9.8 CRITICALEPSS 1.37%
  1. Published25 Feb 2026

Description

TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. A vulnerability in versions prior to 2.01 allows unauthenticated remote attackers to bypass the web server's CGI parameter security controls. Depending on the server configuration and the specific CGI executable in use, the impact is either source code disclosure or remote code execution (RCE). Anyone hosting CGI scripts (particularly interpreted languages like PHP) using vulnerable versions of TinyWeb is impacted. The problem has been patched in version 2.01. If upgrading is not immediately possible, ensure `STRICT_CGI_PARAMS` is enabled (it is defined by default in `define.inc`) and/or do not use CGI executables that natively accept dangerous command-line flags (such as `php-cgi.exe`). If hosting PHP, consider placing the server behind a Web Application Firewall (WAF) that explicitly blocks URL query string parameters that begin with a hyphen (`-`) or contain encoded double quotes (`%22`).

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< 2.01

Remediation

Fixed in
Ritlabs Tinyweb≥ 2.01

References

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Frequently asked

Is CVE-2026-27613 being actively exploited?

CVE-2026-27613 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.37%.

How severe is CVE-2026-27613?

CVE-2026-27613 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.37% probability of exploitation.

Which products are affected by CVE-2026-27613?

Affected products include Ritlabs Tinyweb.

How do I fix CVE-2026-27613?

Upgrade affected software to a fixed version, for example Ritlabs Tinyweb 2.01 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-27613 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.