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CVE-2026-33276— XSS in Unified Search via Unescaped Host/Service Names

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问题，可能导致经过身份验证的用户在其他用户执行统一搜索时执行任意JavaScript。

AI Predicted 6.1 Difficulty: Easy EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-33276

Vulnerability Information
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Vulnerability Title
XSS in Unified Search via Unescaped Host/Service Names
Source: CVE Program / CVE List V5
Vulnerability Description
Stored cross-site scripting (XSS) in Checkmk 2.5.0 (beta) before 2.5.0b2 allows authenticated users with permission to create hosts or services to execute arbitrary JavaScript in the browsers of other users performing searches in the Unified Search feature.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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问题，可能导致经过身份验证的用户在其他用户执行统一搜索时执行任意JavaScript。
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-2026-33276

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III. Intelligence Information for CVE-2026-33276

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Patches & Fixes for CVE-2026-33276 (1)

IV. Related Vulnerabilities

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