What is CVE-2026-100253?

CVE-2026-100253 is a high-severity vulnerability in Jetbrains Teamcity, classified under Incomplete List of Disallowed Inputs. CVSS score: 8.8/10. Published 2026-09-30.

How severe is CVE-2026-100253?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Jetbrains Teamcity

CVE-2026-100253

In JetBrains TeamCity before 2026.2, 2026.1.4, 2025.11.8 sandbox escape leading to code execution was possible via the versioned settings Kotlin DSL

Published 2026-09-30 · last modified 2026-10-01.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Jetbrains Teamcity

Weakness classification (CWE)

CWE-184 — Incomplete List of Disallowed Inputs

References

www.jetbrains.com/privacy-security/issues-fixed/

Frequently asked questions

What is CVE-2026-100253?: CVE-2026-100253 is a high-severity vulnerability in Jetbrains Teamcity, classified under Incomplete List of Disallowed Inputs. CVSS score: 8.8/10. Published 2026-09-30.
How severe is CVE-2026-100253?: High severity. CVSS v3 base score is 8.8 out of 10.