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CVE Vulnerability Details :
CVE-2025-64999
PUBLISHED
More InfoOfficial Page
Assigner-Checkmk
Assigner Org ID-f7d6281c-4801-44ce-ace2-493291dedb0f
View Known Exploited Vulnerability (KEV) details
Published At-26 Feb, 2026 | 10:26
Updated At-26 Feb, 2026 | 14:28
Rejected At-
▼CVE Numbering Authority (CNA)
Cross-site scripting in HTML logs of Synthetic Monitoring test services

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 logs, which can then be accessed via a crafted phishing link.

Affected Products
Vendor
Checkmk GmbHCheckmk GmbH
Product
Checkmk
Default Status
unaffected
Versions
Affected
  • From 2.4.0 before 2.4.0p22 (semver)
  • From 2.3.0 before 2.3.0p43 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-79CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Type: CWE
CWE ID: CWE-79
Description: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Metrics
VersionBase scoreBase severityVector
4.07.3HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N
Version: 4.0
Base score: 7.3
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-592CAPEC-592: Stored XSS
CAPEC ID: CAPEC-592
Description: CAPEC-592: Stored XSS
Solutions
Configurations
Workarounds
Exploits
Credits
reporter
Lisa Gnedt (SBA Research)
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://checkmk.com/werk/19238
vendor-advisory
Hyperlink: https://checkmk.com/werk/19238
Resource:
vendor-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found