CVE-2026-7186Network attack vector

Stored XSS via unrestricted URL widget schemes

Published Jun 8, 2026 · Updated Jun 8, 2026

Stored XSS in Checkmk's URL dashboard widget allows remote authenticated users to execute scripts in dashboard viewers' browsers. The widget stores any supplied URI scheme and renders the resulting link, so a javascript: URL executes in another viewer's browser session. Exploitation requires dashboard-editing permission and a victim to open the shared dashboard; affected releases are before 2.5.0p5, before 2.4.0p31, before 2.3.0p48, and all 2.2.0 versions.

CVSS severity8.5
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Checkmk's URL dashboard widget allows remote authenticated users to execute scripts in dashboard viewers' browsers. The widget stores any supplied URI scheme and renders the resulting link, so a javascript: URL executes in another viewer's browser session. Exploitation requires dashboard-editing permission and a victim to open the shared dashboard; affected releases are before 2.5.0p5, before 2.4.0p31, before 2.3.0p48, and all 2.2.0 versions.

The record

CVE
CVE-2026-7186
Published
Jun 8, 2026
Updated
Jun 8, 2026
Vendor
Checkmk GmbH
Product
Checkmk
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.2.0
  2. Affected versionversion=2.3.0 <2.3.0p48
  3. Affected versionversion=2.4.0 <2.4.0p31
  4. Affected versionversion=2.5.0 <2.5.0p5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Checkmk GmbH · Checkmkversion=2.2.0; version=2.3.0 <2.3.0p48; version=2.4.0 <2.4.0p31; version=2.5.0 <2.5.0p5

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
8.5Checkmk GmbHCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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