CVE-2025-39663 is a high-severity Cross-Site Scripting (XSS) vulnerability affecting Checkmk versions before 2.4.0p14, 2.3.0p39, 2.2.0, and 2.1.0 (EOL). This flaw allows a compromised remote Checkmk site to inject malicious HTML into service outputs displayed on a central monitoring site. With a CVSS score of 8.4 (HIGH), successful exploitation could lead to high impact on confidentiality, integrity, and availability, requiring high privileges and user interaction. Currently, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2.0.0, < 2.3.0CPE matchmatch criteria | cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:* | ||
2.3.0CPE matchmatch criteria | cpe:2.3:a:checkmk:checkmk:2.3.0:-:*:*:*:*:*:* | ||
2.3.0CPE matchmatch criteria | cpe:2.3:a:checkmk:checkmk:2.3.0:p1:*:*:*:*:*:* | ||
2.3.0CPE matchmatch criteria | cpe:2.3:a:checkmk:checkmk:2.3.0:p10:*:*:*:*:*:* | ||
2.3.0CPE matchmatch criteria | cpe:2.3:a:checkmk:checkmk:2.3.0:p11:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.4 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.