What is CVE-2020-28919?

CVE-2020-28919 is a medium-severity vulnerability in Checkmk, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-01-15.

How severe is CVE-2020-28919?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Checkmk

CVE-2020-28919

A stored cross site scripting (XSS) vulnerability in Checkmk 1.6.0x prior to 1.6.0p19 allows an authenticated remote attacker to inject arbitrary JavaScript via a javascript: URL in a view title.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-01-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.011 (63.7th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 63.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Checkmk — versions 1.6.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

checkmk.com/check_mk-werks.php (Vendor Advisory)
github.com/tribe29/checkmk/commit/c00f450f884d8a229b7d8ab3f0452ed802a1ae04 (Patch, Third Party Advisory)
github.com/tribe29/checkmk/commit/e7fd8e4c90be490e4293ec91804d00ec01af5ca6 (Patch)
emacsninja.com/posts/cve-2020-28919-stored-xss-in-checkmk-160p18.html (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-28919?: CVE-2020-28919 is a medium-severity vulnerability in Checkmk, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-01-15.
How severe is CVE-2020-28919?: Medium severity. CVSS v3 base score is 5.4 out of 10.