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CVE-2026-9549— Fix XSS in service discovery active check output

Quick assessment

Affected
Checkmk GmbH Checkmk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Checkmk是Checkmk公司的一个 IT 监控平台。 Checkmk 2.5.0p5之前版本、2.4.0p31之前版本、2.3.0p48之前版本和所有2.2.0版本存在跨站脚本漏洞，该漏洞源于服务发现主动检查输出中的存储型跨站脚本漏洞，允许可以配置主动或自定义检查的管理员在检查输出中注入恶意HTML或JavaScript，在管理员或具有主机读取权限的用户在服务发现页面上运行检查时执行。

AI Predicted 7.4 Difficulty: Moderate EPSS 0.14% · P4

Affected Version Matrix 4

VendorProduct Version RangeStatus
Checkmk GmbH Checkmk 2.5.0< 2.5.0p5 affected
2.4.0< 2.4.0p31 affected
2.3.0< 2.3.0p48 affected
2.2.0 affected
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I. Basic Information for CVE-2026-9549

Vulnerability Information
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Vulnerability Title
Fix XSS in service discovery active check output
Source: CVE Program / CVE List V5
Vulnerability Description
Stored cross-site scripting in the service discovery active check output in Checkmk <2.5.0p5, <2.4.0p31, <2.3.0p48, and all 2.2.0 versions allows an administrator who can configure active or custom checks to inject malicious HTML or JavaScript into check output that executes in the browser of an admin or a user with host read permissions when they run the check on the service discovery page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Checkmk 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Checkmk是Checkmk公司的一个 IT 监控平台。 Checkmk 2.5.0p5之前版本、2.4.0p31之前版本、2.3.0p48之前版本和所有2.2.0版本存在跨站脚本漏洞，该漏洞源于服务发现主动检查输出中的存储型跨站脚本漏洞，允许可以配置主动或自定义检查的管理员在检查输出中注入恶意HTML或JavaScript，在管理员或具有主机读取权限的用户在服务发现页面上运行检查时执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Checkmk GmbH Checkmk 2.5.0 ~ 2.5.0p5 -

II. Public POCs for CVE-2026-9549

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III. Intelligence Information for CVE-2026-9549

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Patches & Fixes for CVE-2026-9549 (1)

Same Patch Batch · Checkmk GmbH · 2026-06-08 · 5 CVEs total

CVE-2026-7186 Fix stored XSS in URL dashboard widget via dangerous URI schemes
CVE-2026-7765 User Messages widget leaked issuer messages on shared dashboards
CVE-2026-8833 XSS in urls
CVE-2026-8078 Fix stored XSS in global settings change log

IV. Related Vulnerabilities

Same product: Checkmk
Same vendor: Checkmk GmbH
Same weakness: CWE-79