Vulnerability DatabaseCVE-2026-20915
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CVE-2026-20915
Published:March 31, 2026
Updated:August 06, 2026
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.
Affected Packages
https://github.com/Checkmk/checkmk.git (GITHUB):
Affected version(s) =v2.5.0b1 <v2.5.0b2
Fix Suggestion:
Update to version v2.5.0b2
Related Resources (3)
https://checkmk.com/werk/19526
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/20xxx/CVE-2026-20915.json
https://nvd.nist.gov/vuln/detail/CVE-2026-20915
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CVSS v4
Base Score:
8.5
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.4
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-79
EPSS
Base Score:
0.15