CVE-2026-66621Network attack vector

Unauthenticated script execution in users' browsers

Published Aug 18, 2026 · Updated Aug 25, 2026

DOM-based XSS in MapSteps UG Ultimate Dashboard Pro 3.11.2 and earlier allows remote attackers to execute scripts in a user's browser. Neither MapSteps UG nor Patchstack has published the affected client-side code, input source, or DOM sink that processes untrusted data. Exploitation requires a user to open attacker-controlled content, allowing script execution in the Ultimate Dashboard origin.

CVSS severity7.1
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DOM-based XSS in MapSteps UG Ultimate Dashboard Pro 3.11.2 and earlier allows remote attackers to execute scripts in a user's browser. Neither MapSteps UG nor Patchstack has published the affected client-side code, input source, or DOM sink that processes untrusted data. Exploitation requires a user to open attacker-controlled content, allowing script execution in the Ultimate Dashboard origin.

The record

CVE
CVE-2026-66621
Published
Aug 18, 2026
Updated
Aug 25, 2026
Vendor
MapSteps UG
Product
Ultimate Dashboard Pro
Classifications
CWE-79, CAPEC-588, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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=n/a <=3.11.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

MapSteps UG · Ultimate Dashboard Proversion=n/a <=3.11.2

Published CVSS scores

7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-588DOM-Based XSS
T1203Exploitation for Client Execution

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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