PT-2025-44396 · Checkmk · Checkmk

Lisa Gnedt · Published 2025-10-30 · Updated 2025-10-31 · CVE-2025-39663

Positive Technologies (AI Summary)

CVSS v4.0

8.5

High

Base vector

AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Checkmk versions prior to 2.4.0p14 Checkmk versions prior to 2.3.0p39 Checkmk versions 2.2.0 Checkmk version 2.1.0

Description A Cross-Site Scripting (XSS) issue exists in Checkmk's distributed monitoring functionality. A compromised remote site can inject malicious HTML code into service outputs on the central site. This allows for potential JavaScript injection and Remote Code Execution (RCE) in distributed setups.

Recommendations Versions prior to 2.4.0p14 should be updated. Versions prior to 2.3.0p39 should be updated. For version 2.2.0, consider disabling “Trust this site completely”. For version 2.1.0, consider disabling “Trust this site completely”.

Exploit

Fix

RCE

XSS

Weakness Enumeration

CWE-80

CWE-79

Related Identifiers

CVE-2025-39663

Affected Products

Checkmk

References · 14

• 🔥 https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting · Exploit
• 🔥 http://seclists.org/fulldisclosure/2025/Nov/0 · Exploit
• https://cve.org/CVERecord?id=CVE-2025-39663 · Security Note
• https://ubuntu.com/security/CVE-2025-39663 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39663 · Vendor Advisory
• https://checkmk.com/werk/17998 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-39663 · Security Note
• https://osv.dev/vulnerability/CVE-2025-39663 · Vendor Advisory
• https://t.me/CVEtracker/36178 · Telegram Post
• https://twitter.com/CVEnew/status/1983849781924638966 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1983927303571689883 · Twitter Post
• https://t.me/cveNotify/140934 · Telegram Post
• https://t.me/cveNotify/140954 · Telegram Post
• https://twitter.com/weippl/status/1984280711826681874 · Twitter Post