10

CVE-2026-22781: maximmasiutin tinyweb OS Command Injection

CVSS: 10.0v4.0CriticalAnalyzed
Published 12-01-2026Last modified 12-01-2026
Open JSON

Vulnerability summary

CVE-2026-22781 is a critical (CVSS 10.0) OS Command Injection vulnerability in maximmasiutin tinyweb. EPSS estimates a 2.44% chance of exploitation in the next 30 days, higher than 84% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
10.0/10
010
Critical · v4.0 (CVE.org)
EPSS score
2.44%
0%100%
Low · -0.03 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-01-2026
    PublishedVulnerability first disclosed.
  2. 12-01-2026
    Last modifiedVulnerability information updated.

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 metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

2.44%

Chance of exploitation in the next 30 days

Percentile

84%

Versus all other CVEs

30-day change

-0.03 pp

From 2.47% on 19-09-2026

19-09-202619-10-2026
EPSS score
2.44%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Maximmasiutin1 product
Ritlabs1 product

2 vendors · 2 products

References

3 links