What is CVE-2020-15831?

CVE-2020-15831 is a medium-severity vulnerability in Jetbrains Teamcity, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-08-08.

How severe is CVE-2020-15831?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Jetbrains Teamcity

CVE-2020-15831

JetBrains TeamCity before 2019.2.3 is vulnerable to reflected XSS in the administration UI.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-08-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (49.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Jetbrains Teamcity

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

blog.jetbrains.com (Vendor Advisory)
blog.jetbrains.com/blog/2020/08/06/jetbrains-security-bulletin-q2-2020/ (Vendor Advisory)

Frequently asked questions

What is CVE-2020-15831?: CVE-2020-15831 is a medium-severity vulnerability in Jetbrains Teamcity, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2020-08-08.
How severe is CVE-2020-15831?: Medium severity. CVSS v3 base score is 6.1 out of 10.