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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-9549

22
FAUCET Score

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.

First published: Jun 8, 2026Last modified: Jun 8, 2026

Impacted Technologies

VendorProductVersion(s)CPE
2.2.0CPE matchmatch criteria
cpe:2.3:a:checkmk:checkmk:2.2.0:-:*:*:*:*:*:*
2.2.0CPE matchmatch criteria
cpe:2.3:a:checkmk:checkmk:2.2.0:b1:*:*:*:*:*:*
2.2.0CPE matchmatch criteria
cpe:2.3:a:checkmk:checkmk:2.2.0:b2:*:*:*:*:*:*
2.2.0CPE matchmatch criteria
cpe:2.3:a:checkmk:checkmk:2.2.0:b3:*:*:*:*:*:*
2.2.0CPE matchmatch criteria
cpe:2.3:a:checkmk:checkmk:2.2.0:b4:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

4.8MEDIUM

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
Attack Requirements
NONE
Privileges Required
HIGH
User Interaction
PASSIVE
VS Confidentiality
NONE
VS Integrity
LOW
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
LOW
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.14%
Probability of exploitation in next 30 days
EPSS Percentile
4.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0014 is in the 1st percentile among its peer group of 4,937 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

checkmk.com / werk/17993
Vendor Advisory