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checkmk

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.

CVE-2026-33276 is a stored cross-site scripting (XSS) vulnerability identified in Checkmk, a widely used IT infrastructure monitoring software developed by Checkmk GmbH. The flaw exists in versions 2.5.0b1 and earlier beta releases before 2.5.0b2. It arises from improper neutralization of user-supplied input during web page generation, specifically within the Unified Search feature. Authenticated users who have permissions to create hosts or services can inject malicious JavaScript code into the system. When other users perform searches using the Unified Search, the injected script executes in their browsers. This can lead to session hijacking, theft of sensitive information, or execution of unauthorized actions within the Checkmk web interface. The vulnerability has a CVSS 4.0 base score of 8.6, indicating high severity, with an attack vector of network, low attack complexity, no need for additional privileges beyond host/service creation rights, and requires user interaction (victims performing searches). The vulnerability does not require system-level privileges or administrator rights, but the ability to create hosts or services is sufficient. No public exploits have been reported yet, but the potential impact is significant given the nature of the software and the access it provides to monitoring data and infrastructure controls.

Detailed information about CVE-2026-33276: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Checkmk GmbH Checkmk 

CVE-2026-33276: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Checkmk GmbH Checkmk - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-33276: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Checkmk GmbH Checkmk

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