CVE-2026-27662

Unauthenticated browser access via Control Panel help link

Published May 12, 2026 · Updated May 12, 2026

Control Panel escape in Siemens SIMATIC HMI Unified Comfort Panels before V21 allows local users to open the web browser without authentication. The Control Panel help link launches the browser without enforcing corresponding security mechanisms. Physical or local console access is required; the exposed browser permits unauthorized actions and misconfiguration of the panel.

CVSS severity7.0
High
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Control Panel escape in Siemens SIMATIC HMI Unified Comfort Panels before V21 allows local users to open the web browser without authentication. The Control Panel help link launches the browser without enforcing corresponding security mechanisms. Physical or local console access is required; the exposed browser permits unauthorized actions and misconfiguration of the panel.

The record

CVE
CVE-2026-27662
Published
May 12, 2026
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC HMI MTP2200 Comfort Pro for stand (expandable, flange at the bottom)
Classifications
CWE-1188
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 12, 2026CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <V21

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Siemens · SIMATIC HMI MTP2200 Comfort Pro for stand (expandable, flange at the bottom)version=0 <V21
Siemens · SIMATIC HMI MTP1000, Unified Comfort Panel neutralversion=0 <V21
Siemens · SIMATIC HMI MTP1900 Comfort Pro for support arm (expandable, round tube) and extension unitversion=0 <V21
Siemens · SIMATIC HMI MTP700 Unified Comfort Panelversion=0 <V21
Siemens · SIMATIC HMI MTP1200 Comfort Pro neutral design for stand (expandable, flange at the bottom)version=0 <V21
Siemens · SIMATIC HMI MTP2200 Comfort Pro neutral design for support arm (expandable, round tube) and extension unitversion=0 <V21
Siemens · SIMATIC HMI MTP1200 Comfort Pro neutral design for support arm (not extendable, flange on top)version=0 <V21
Siemens · SIMATIC HMI MTP1200 Comfort Pro for stand (expandable, flange at the bottom)version=0 <V21
Siemens · SIMATIC HMI MTP2200 Comfort Pro for support arm (expandable, round tube) and extension unitversion=0 <V21
Siemens · SIMATIC HMI MTP1000 Unified Comfort Panelversion=0 <V21
Siemens · SIMATIC HMI MTP1200 Comfort Pro for support arm (expandable, round tube) and extension unitversion=0 <V21
Siemens · SIMATIC HMI MTP1200 Comfort Pro neutral design for support arm (expandable, round tube) and extension unitversion=0 <V21
Siemens · SIMATIC HMI MTP700, Unified Comfort Panel neutral designversion=0 <V21
Siemens · SIMATIC HMI MTP1900 Comfort Pro neutral design for support arm (not extendable, flange on top)version=0 <V21
Siemens · SIMATIC HMI MTP1500 Comfort Pro for support arm (not extendable, flange on top)version=0 <V21
Siemens · SIMATIC HMI MTP1900 Unified Comfort Panel neutral designversion=0 <V21
Siemens · SIMATIC HMI MTP1500 Unified Comfort Panel hygienic neutral designversion=0 <V21
Siemens · SIMATIC HMI MTP2200 Unified Comfort Hygienic neutral designversion=0 <V21
Siemens · SIMATIC HMI MTP1200 Unified Comfort Panelversion=0 <V21
Siemens · SIMATIC HMI MTP1500 Unified Comfort Panel neutral designversion=0 <V21
Siemens · SIPLUS HMI MTP1000 Unified Comfortversion=0 <V21
Siemens · SIMATIC HMI MTP2200 Comfort Pro neutral design for support arm (not extendable, flange on top)version=0 <V21
Siemens · SIMATIC HMI MTP1200 Unified Comfort Panel hygienicversion=0 <V21
Siemens · SIMATIC HMI MTP1900 Unified Comfort Panel hygienic neutral designversion=0 <V21
Siemens · SIMATIC HMI MTP2200 Comfort Pro neutral design for stand (expandable, flange at the bottom)version=0 <V21
Siemens · SIMATIC HMI MTP1900 Unified Comfort Panel hygienicversion=0 <V21
Siemens · SIMATIC HMI MTP1900 Comfort Pro neutral design for support arm (expandable, round tube) and extension unitversion=0 <V21
Siemens · SIMATIC HMI MTP1500 Comfort Pro for stand (expandable, flange at the bottom)version=0 <V21
Siemens · SIPLUS HMI MTP1200 Unified Comfortversion=0 <V21
Siemens · SIMATIC HMI MTP1900 Comfort Pro for support arm (not extendable, flange on top)version=0 <V21
Siemens · SIMATIC HMI MTP1200 Unified Comfort Panel hygienic neutral designversion=0 <V21
Siemens · SIMATIC HMI MTP2200 Comfort Pro for support arm (not extendable, flange on top)version=0 <V21
Siemens · SIMATIC HMI MTP1500 Comfort Pro for support arm (expandable, round tube) and extension unitversion=0 <V21
Siemens · SIMATIC HMI MTP1500 Comfort Pro neutral design for stand (expandable, flange at the bottom)version=0 <V21
Siemens · SIMATIC HMI MTP1500 Unified Comfort Panelversion=0 <V21
Siemens · SIMATIC HMI MTP1500 Unified Comfort Panel hygienicversion=0 <V21
Siemens · SIMATIC HMI MTP1900 Unified Comfort Panelversion=0 <V21
Siemens · SIMATIC HMI MTP1000 Unified Comfort Panel hygienicversion=0 <V21
Siemens · SIMATIC HMI MTP700 Unified Comfort Panel hygienic neutral designversion=0 <V21
Siemens · SIMATIC HMI MTP2200 Unified Comfort Panel neutral designversion=0 <V21
Siemens · SIMATIC HMI MTP1000 Unified Comfort Panel hygienic neutral designversion=0 <V21
Siemens · SIMATIC HMI MTP1200 Unified Comfort Panel neutral designversion=0 <V21
Siemens · SIMATIC HMI MTP1200 Comfort Pro for support arm (not extendable, flange on top)version=0 <V21
Siemens · SIMATIC HMI MTP1900 Comfort Pro neutral design for stand (expandable, flange at the bottom)version=0 <V21
Siemens · SIPLUS HMI MTP700 Unified Comfortversion=0 <V21
Siemens · SIMATIC HMI MTP2200 Unified Comfort Panelversion=0 <V21
Siemens · SIMATIC HMI MTP2200 Unified Comfort Hygienicversion=0 <V21
Siemens · SIMATIC HMI MTP1500 Comfort Pro neutral design for support arm (not extendable, flange on top)version=0 <V21
Siemens · SIMATIC HMI MTP1500 Comfort Pro neutral design for support arm (expandable, round tube) and extension unitversion=0 <V21
Siemens · SIMATIC HMI MTP1900 Comfort Pro for stand (expandable, flange at the bottom)version=0 <V21

Published CVSS scores

7.7SiemensCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
7.0SiemensCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1188Initialization of a Resource with an Insecure Default

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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