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CVE-2026-20915— Stored cross-site scripting in Pending Changes sidebar

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 2.5.0b2之前版本存在安全漏洞，该漏洞源于存储型跨站脚本，可能导致经过身份验证的用户在Pending Changes侧边栏注入恶意JavaScript，并在其他用户查看时执行。

AI Predicted 6.1 Difficulty: Easy EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript
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I. Basic Information for CVE-2026-20915

Vulnerability Information
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Vulnerability Title
Stored cross-site scripting in Pending Changes sidebar
Source: CVE Program / CVE List V5
Vulnerability Description
Stored cross-site scripting (XSS) in Checkmk version 2.5.0 (beta) before 2.5.0b2 allows authenticated users with permission to create pending changes to inject malicious JavaScript into the Pending Changes sidebar, which will execute in the browsers of other users viewing the sidebar.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:H/VI:H/VA:H/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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Checkmk是Checkmk公司的一个 IT 监控平台。 Checkmk 2.5.0b2之前版本存在安全漏洞，该漏洞源于存储型跨站脚本，可能导致经过身份验证的用户在Pending Changes侧边栏注入恶意JavaScript，并在其他用户查看时执行。
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 2.5.0b1 ~ 2.5.0b2 -

II. Public POCs for CVE-2026-20915

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III. Intelligence Information for CVE-2026-20915

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Patches & Fixes for CVE-2026-20915 (1)

IV. Related Vulnerabilities

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