VulnerabilityPublished 12 May 2026

CVE-2026-27662: Siemens SIMATIC HMI MTP1000 Unified Comfort Panel · Insecure Default

Affects Siemens SIMATIC HMI MTP1000 Unified Comfort PanelSource CVE Database V5

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Not known to be exploited · CVSS 7.7 High : upgrade to 21 soon.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score

7.7High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 21

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Attack Vector: Local
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: High
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Local: The vulnerable component is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., tricking a legitimate user into opening a malicious document).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 12 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade SIMATIC HMI MTP1000 Unified Comfort Panel and SIMATIC HMI MTP1000 Unified Comfort Panel hygienic and SIMATIC HMI MTP1000 Unified Comfort Panel hygienic neutral design and SIMATIC HMI MTP1000, Unified Comfort Panel neutral and SIMATIC HMI MTP1200 Comfort Pro for stand (expandable, flange at the bottom) and SIMATIC HMI MTP1200 Comfort Pro for support arm (expandable, round tube) and extension unit and SIMATIC HMI MTP1200 Comfort Pro for support arm (not extendable, flange on top) and SIMATIC HMI MTP1200 Comfort Pro neutral design for stand (expandable, flange at the bottom) and SIMATIC HMI MTP1200 Comfort Pro neutral design for support arm (expandable, round tube) and extensio and SIMATIC HMI MTP1200 Comfort Pro neutral design for support arm (not extendable, flange on top) and SIMATIC HMI MTP1200 Unified Comfort Panel and SIMATIC HMI MTP1200 Unified Comfort Panel hygienic and SIMATIC HMI MTP1200 Unified Comfort Panel hygienic neutral design and SIMATIC HMI MTP1200 Unified Comfort Panel neutral design and SIMATIC HMI MTP1500 Comfort Pro for stand (expandable, flange at the bottom) and SIMATIC HMI MTP1500 Comfort Pro for support arm (expandable, round tube) and extension unit and SIMATIC HMI MTP1500 Comfort Pro for support arm (not extendable, flange on top) and SIMATIC HMI MTP1500 Comfort Pro neutral design for stand (expandable, flange at the bottom) and SIMATIC HMI MTP1500 Comfort Pro neutral design for support arm (expandable, round tube) and extensio and SIMATIC HMI MTP1500 Comfort Pro neutral design for support arm (not extendable, flange on top) and SIMATIC HMI MTP1500 Unified Comfort Panel and SIMATIC HMI MTP1500 Unified Comfort Panel hygienic and SIMATIC HMI MTP1500 Unified Comfort Panel hygienic neutral design and SIMATIC HMI MTP1500 Unified Comfort Panel neutral design and SIMATIC HMI MTP1900 Comfort Pro for stand (expandable, flange at the bottom) and SIMATIC HMI MTP1900 Comfort Pro for support arm (expandable, round tube) and extension unit and SIMATIC HMI MTP1900 Comfort Pro for support arm (not extendable, flange on top) and SIMATIC HMI MTP1900 Comfort Pro neutral design for stand (expandable, flange at the bottom) and SIMATIC HMI MTP1900 Comfort Pro neutral design for support arm (expandable, round tube) and extensio and SIMATIC HMI MTP1900 Comfort Pro neutral design for support arm (not extendable, flange on top) and SIMATIC HMI MTP1900 Unified Comfort Panel and SIMATIC HMI MTP1900 Unified Comfort Panel hygienic and SIMATIC HMI MTP1900 Unified Comfort Panel hygienic neutral design and SIMATIC HMI MTP1900 Unified Comfort Panel neutral design and SIMATIC HMI MTP2200 Comfort Pro for stand (expandable, flange at the bottom) and SIMATIC HMI MTP2200 Comfort Pro for support arm (expandable, round tube) and extension unit and SIMATIC HMI MTP2200 Comfort Pro for support arm (not extendable, flange on top) and SIMATIC HMI MTP2200 Comfort Pro neutral design for stand (expandable, flange at the bottom) and SIMATIC HMI MTP2200 Comfort Pro neutral design for support arm (expandable, round tube) and extensio and SIMATIC HMI MTP2200 Comfort Pro neutral design for support arm (not extendable, flange on top) and SIMATIC HMI MTP2200 Unified Comfort Hygienic and SIMATIC HMI MTP2200 Unified Comfort Hygienic neutral design and SIMATIC HMI MTP2200 Unified Comfort Panel and SIMATIC HMI MTP2200 Unified Comfort Panel neutral design and SIMATIC HMI MTP700 Unified Comfort Panel and SIMATIC HMI MTP700 Unified Comfort Panel hygienic neutral design and SIMATIC HMI MTP700, Unified Comfort Panel neutral design and SIPLUS HMI MTP1000 Unified Comfort and SIPLUS HMI MTP1200 Unified Comfort and SIPLUS HMI MTP700 Unified Comfort to 21.

Affected software

Product	Affected	Fixed in
SiemensSIMATIC HMI MTP1000 Unified Comfort Panel	Affected <21	Fixed in 21
SiemensSIMATIC HMI MTP1000 Unified Comfort Panel hygienic	Affected <21	Fixed in 21
SiemensSIMATIC HMI MTP1000 Unified Comfort Panel hygienic neutral design	Affected <21	Fixed in 21
SiemensSIMATIC HMI MTP1000, Unified Comfort Panel neutral	Affected <21	Fixed in 21
SiemensSIMATIC HMI MTP1200 Comfort Pro for stand (expandable, flange at the bottom)	Affected <21	Fixed in 21
SiemensSIMATIC HMI MTP1200 Comfort Pro for support arm (expandable, round tube) and extension unit	Affected <21	Fixed in 21

AI-suggested

If you cannot patch yet, ensure that appropriate security mechanisms are configured on the device to restrict access to the web browser interface. Limit physical and network access to the Control Panel to trusted personnel only to reduce risk of exploitation.

Description

Affected devices do not properly restrict access to the web browser via the Control Panel when no corresponding security mechanisms are in place. This could allow an unauthenticated attacker to gain unauthorized access to the web browser, potentially enabling the discovery of backdoors, performing unauthorized actions, or exploiting misconfigurations that may lead to further system compromise.

Impact

An unauthenticated attacker with local access to the device can gain unauthorized access to the web browser interface. This access could lead to discovery of backdoors, unauthorized actions, or exploitation of misconfigurations, potentially resulting in further compromise of the affected system's integrity and availability. Confidentiality impact is not indicated. The vulnerability does not require privileges or user interaction and has low attack complexity, increasing the risk if the device is accessible.

CWE-1188Initialization of a Resource with an Insecure Default (opens in a new tab)
Base weakness
The product initializes or sets a resource with a default that is intended to be changed by the product's installer, administrator, or maintainer, but the default is not secure.
OWASP Cheat Sheets
Forgot Password (opens in a new tab)
OWASP ASVS 4.0.3
V2.3.1 (opens in a new tab)
V2.6.2 (opens in a new tab)
V2.7.6 (opens in a new tab)
Attack patterns
Exploitation of Thunderbolt Protection Flaws (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

cert-portal.siemens.com/productcert/html/ssa-387223.html (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 19 May 2026, 09:47 UTC

WeaknessesCWE-1188

Technical details

References

Community reviews

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