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8.5
HIGH CVSS 4.0
CVE-2025-39663
Cross Site Scripting through compromised remote site
Description

Cross-Site Scripting (XSS) vulnerability in Checkmk's distributed monitoring allows a compromised remote site to inject malicious HTML code into service outputs in the central site. Affecting Checkmk before 2.4.0p14, 2.3.0p39, 2.2.0 and 2.1.0 (eol).

INFO

Published Date :

Oct. 30, 2025, 11:15 a.m.

Last Modified :

Dec. 3, 2025, 8:06 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2025-39663 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Tribe29 checkmk
1 Checkmk checkmk
: Total Affected Vendor : 2 | Products : 2
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH [email protected]
CVSS 4.0 HIGH [email protected]
Solution
Update Checkmk to a patched version to fix XSS vulnerability in distributed monitoring.
  • Upgrade Checkmk to version 2.4.0p14 or later.
  • Upgrade Checkmk to version 2.3.0p39 or later.
  • Upgrade Checkmk to version 2.2.0 or later.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-39663.

URL Resource
https://checkmk.com/werk/17998 Vendor Advisory
https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting Exploit Third Party Advisory
http://seclists.org/fulldisclosure/2025/Nov/0 Exploit Mailing List Third Party Advisory
https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting Exploit Third Party Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-39663 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-39663 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-39663 vulnerability anywhere in the article.

  • seclists.org
[SBA-ADV-20250729-01] CVE-2025-39663: Checkmk Cross Site Scripting

Full Disclosure mailing list archives From: SBA Research Security Advisory via Fulldisclosure <fulldisclosure () seclists org> Date: Thu, 30 Oct 2025 09:16:25 +0000 -----BEGIN PGP SIGNED MESSAGE----- ... Read more

Published Date: Nov 07, 2025 (1 month, 1 week ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-39663 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Dec. 03, 2025

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
    Added CWE CWE-79
    Added CPE Configuration OR *cpe:2.3:a:checkmk:checkmk:2.3.0:p1:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p2:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p3:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p4:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p5:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p6:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p17:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p16:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p15:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p14:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p13:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p12:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p11:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p10:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p9:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p8:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p7:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:-:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p20:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:p10:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:p5:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:p4:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:p3:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:p2:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:p1:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p34:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p33:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p32:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p31:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p30:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p29:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p28:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p27:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p26:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p25:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p24:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p23:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p22:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p21:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p19:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p18:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:-:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:*:*:*:*:*:*:*:* versions from (including) 2.0.0 up to (excluding) 2.3.0 *cpe:2.3:a:checkmk:checkmk:2.4.0:p13:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:p12:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:p11:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:p9:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:p7:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.4.0:p6:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p38:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p37:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p36:*:*:*:*:*:* *cpe:2.3:a:checkmk:checkmk:2.3.0:p35:*:*:*:*:*:*
    Added Reference Type Checkmk GmbH: https://checkmk.com/werk/17998 Types: Vendor Advisory
    Added Reference Type Checkmk GmbH: https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting Types: Exploit, Third Party Advisory
    Added Reference Type CISA-ADP: https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting Types: Exploit, Third Party Advisory
    Added Reference Type CVE: http://seclists.org/fulldisclosure/2025/Nov/0 Types: Exploit, Mailing List, Third Party Advisory
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 07, 2025

    Action Type Old Value New Value
    Added Reference http://seclists.org/fulldisclosure/2025/Nov/0
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Oct. 30, 2025

    Action Type Old Value New Value
    Added Reference https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting
  • New CVE Received by [email protected]

    Oct. 30, 2025

    Action Type Old Value New Value
    Added Description Cross-Site Scripting (XSS) vulnerability in Checkmk's distributed monitoring allows a compromised remote site to inject malicious HTML code into service outputs in the central site. Affecting Checkmk before 2.4.0p14, 2.3.0p39, 2.2.0 and 2.1.0 (eol).
    Added CVSS V4.0 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
    Added CWE CWE-80
    Added Reference https://checkmk.com/werk/17998
    Added Reference https://github.com/sbaresearch/advisories/tree/82fd27e4570433464c30b35150b197db9a850f4e/2025/SBA-ADV-20250729-01_Checkmk_Cross_Site_Scripting
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 8.5
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Base CVSS Score: 8.4
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact