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CVE-2026-33276

Medium priority
Needs evaluation

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...

1 affected package

check-mk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
check-mk Not in release Not in release Needs evaluation
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CVE-2026-24096

Medium priority
Needs evaluation

Insufficient permission validation on multiple REST API Quick Setup endpoints in Checkmk 2.5.0 (beta) before version 2.5.0b2 and 2.4.0 before version 2.4.0p25 allows low-privileged users to perform unauthorized actions or obtain...

1 affected package

check-mk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
check-mk Not in release Not in release Needs evaluation
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CVE-2026-20915

Medium priority
Needs evaluation

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...

1 affected package

check-mk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
check-mk Not in release Not in release Needs evaluation
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CVE-2025-64998

Medium priority
Needs evaluation

Exposure of session signing secret in Checkmk <2.4.0p23, <2.3.0p45 and 2.2.0 allows an administrator of a remote site with config sync enabled to hijack sessions on the central site by forging session cookies.

1 affected package

check-mk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
check-mk Not in release Not in release Needs evaluation
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CVE-2026-2859

Medium priority
Needs evaluation

Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and 2.2.0 (EOL) allows unauthenticated users to enumerate existing hosts by observing different HTTP response codes in deploy_agent...

1 affected package

check-mk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
check-mk Not in release Not in release Needs evaluation
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CVE-2026-24097

Medium priority
Needs evaluation

Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p23, 2.3.0 before 2.3.0p43, and 2.2.0 (EOL) allows authenticated users to enumerate existing hosts by observing different HTTP response codes...

1 affected package

check-mk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
check-mk Not in release Not in release Needs evaluation
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CVE-2026-3103

Medium priority
Needs evaluation

A logic error in the remove_password() function in Checkmk GmbH's Checkmk versions <2.4.0p23, <2.3.0p43, and 2.2.0 (EOL) allows a low-privileged user to cause data loss.

1 affected package

check-mk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
check-mk Not in release Not in release Needs evaluation
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CVE-2025-64999

Medium priority
Needs evaluation

Improper neutralization of input in Checkmk versions 2.4.0 before 2.4.0p22, and 2.3.0 before 2.3.0p43 allows an attacker that can manipulate a host's check output to inject malicious JavaScript into the Synthetic Monitoring HTML...

1 affected package

check-mk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
check-mk Not in release Not in release Needs evaluation
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CVE-2026-24095

Medium priority
Needs evaluation

Improper permission enforcement in Checkmk versions 2.4.0 before 2.4.0p21, 2.3.0 before 2.3.0p43, and 2.2.0 (EOL) allows users with the "Use WATO" permission to access the "Analyze configuration" page by directly navigating to its...

1 affected package

check-mk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
check-mk Not in release Not in release Needs evaluation
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CVE-2025-65000

Medium priority
Needs evaluation

SSH private keys of the "Remote alert handlers (Linux)" rule were exposed in the rule page's HTML source in Checkmk <= 2.4.0p18 and all versions of Checkmk 2.3.0. This potentially allowed unauthorized triggering of predefined...

1 affected package

check-mk

Package 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
check-mk Not in release Not in release Needs evaluation
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