Description
Improper neutralization of HTML-encoded characters in the URL validation function in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an authenticated user to bypass URL validation and inject malicious URLs such as javascript: URIs, resulting in cross-site scripting when another user interacts with the crafted link.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
https://checkmk.com/werk/20002
Scores
CVSS v3
5.4
EPSS
0.0014
EPSS Percentile
3.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-79
Status
published
Products (1)
checkmk/checkmk
2.2.0 (50 CPE variants)
Published
Jun 08, 2026
Tracked Since
Jun 08, 2026