CVE-2026-27662 (GCVE-0-2026-27662)
Vulnerability from cvelistv5 – Published: 2026-05-12 08:21 – Updated: 2026-05-13 01:48
VLAI
EPSS
VEX
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 01:41 UTC
CWE
- CWE-1188 - Initialization of a Resource with an Insecure Default
Assigner
References
1 reference
Impacted products
50 products
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{
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"product": "SIMATIC HMI MTP1900 Comfort Pro for stand (expandable, flange at the bottom)",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP1900 Comfort Pro for support arm (expandable, round tube) and extension unit",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP1900 Comfort Pro for support arm (not extendable, flange on top)",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP1900 Comfort Pro neutral design for stand (expandable, flange at the bottom)",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP1900 Comfort Pro neutral design for support arm (expandable, round tube) and extensio",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP1900 Comfort Pro neutral design for support arm (not extendable, flange on top)",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP1900 Unified Comfort Panel",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP1900 Unified Comfort Panel hygienic",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP1900 Unified Comfort Panel hygienic neutral design",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP1900 Unified Comfort Panel neutral design",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP2200 Comfort Pro for stand (expandable, flange at the bottom)",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP2200 Comfort Pro for support arm (expandable, round tube) and extension unit",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP2200 Comfort Pro for support arm (not extendable, flange on top)",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP2200 Comfort Pro neutral design for stand (expandable, flange at the bottom)",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP2200 Comfort Pro neutral design for support arm (expandable, round tube) and extensio",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP2200 Comfort Pro neutral design for support arm (not extendable, flange on top)",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP2200 Unified Comfort Hygienic",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP2200 Unified Comfort Hygienic neutral design",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP2200 Unified Comfort Panel",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP2200 Unified Comfort Panel neutral design",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP700\u00a0Unified Comfort Panel",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP700 Unified Comfort Panel hygienic neutral design",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP700 Unified Comfort Panel hygienic neutral design",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIMATIC HMI MTP700, Unified Comfort Panel neutral design",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIPLUS HMI MTP1000 Unified Comfort",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIPLUS HMI MTP1200 Unified Comfort",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
},
{
"defaultStatus": "unknown",
"product": "SIPLUS HMI MTP700 Unified Comfort",
"vendor": "Siemens",
"versions": [
{
"lessThan": "V21",
"status": "affected",
"version": "0",
"versionType": "custom"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "Affected devices do not properly restrict access to the web browser via the Control Panel when no corresponding security mechanisms are in place.\r\nThis 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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.7,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
}
},
{
"cvssV4_0": {
"baseScore": 7,
"baseSeverity": "HIGH",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N",
"version": "4.0"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-1188",
"description": "CWE-1188: Initialization of a Resource with an Insecure Default",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-12T08:21:13.221Z",
"orgId": "cec7a2ec-15b4-4faf-bd53-b40f371f3a77",
"shortName": "siemens"
},
"references": [
{
"url": "https://cert-portal.siemens.com/productcert/html/ssa-387223.html"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "cec7a2ec-15b4-4faf-bd53-b40f371f3a77",
"assignerShortName": "siemens",
"cveId": "CVE-2026-27662",
"datePublished": "2026-05-12T08:21:13.221Z",
"dateReserved": "2026-02-23T10:07:00.530Z",
"dateUpdated": "2026-05-13T01:48:49.217Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.