What is CVE-2023-22288?

CVE-2023-22288 is a medium-severity vulnerability in Checkmk, classified under CWE-138. CVSS score: 4.1/10. Published 2023-03-20.

How severe is CVE-2023-22288?

Medium severity. CVSS v3 base score is 4.1 out of 10.

XSS in Checkmk

CVE-2023-22288

HTML Email Injection in Tribe29 Checkmk <=2.1.0p23; <=2.0.0p34, and all versions of Checkmk 1.6.0 allows an authenticated attacker to inject malicious HTML into Emails

Published 2023-03-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (33.0th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 33.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Checkmk — versions 2.0.0, 2.1.0
Tribe29 Checkmk — versions 2.0.0, 2.1.0, 1.6.0

Weakness classification (CWE)

References

checkmk.com/werk/15069 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-22288?: CVE-2023-22288 is a medium-severity vulnerability in Checkmk, classified under CWE-138. CVSS score: 4.1/10. Published 2023-03-20.
How severe is CVE-2023-22288?: Medium severity. CVSS v3 base score is 4.1 out of 10.