How severe is CVE-2026-22781?

CVE-2026-22781 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-22781 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22781?

CVE-2026-22781 affects Ritlabs Tinyweb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-22781?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-22781 have an EU (EUVD) identifier?

Yes. CVE-2026-22781 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2005.

When was CVE-2026-22781 published?

CVE-2026-22781 was published on 2026-01-12 and last updated on 2026-06-17.

CVE-2026-22781

CVE-2026-22781 is a critical-severity vulnerability in Ritlabs Tinyweb with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 10.0
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-2005
Weakness: CWE-78
Affected product: Ritlabs Tinyweb
Published: 2026-01-12
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-22781?: 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.
How severe is CVE-2026-22781?: CVE-2026-22781 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-22781 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22781?: CVE-2026-22781 affects Ritlabs Tinyweb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-22781?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-22781 have an EU (EUVD) identifier?: Yes. CVE-2026-22781 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-2005.
When was CVE-2026-22781 published?: CVE-2026-22781 was published on 2026-01-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ritlabs:tinyweb:*:*:*:*:*:*:*:*

More vulnerabilities in Ritlabs Tinyweb

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