CVE-2026-9549

MEDIUM EPSS 3.9%
Published Jun 8, 20263w ago · Modified Jun 17, 20261w ago
4.8 CVSS 4.0
Medium
Find Similar
Published Jun 8, 2026 3w ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
4.8
Exploitability
—
Impact
—
Vector string
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction P
Scope X

Threat Intelligence

EPSS Exploit Probability
3.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-79 Cross-site Scripting Injection

Affected Products 157

VendorProductVersionRange
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.2.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.3.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.4.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any
checkmkcheckmk2.5.0any

References 1

  • checkmk.com https://checkmk.com/werk/17993
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.