CVE-2025-40891 (GCVE-0-2025-40891)
Vulnerability from cvelistv5 – Published: 2025-12-18 13:14 – Updated: 2026-08-11 12:22
VLAI
EPSS
VEX
Title
HTML injection in in Time Machine functionality in Guardian/CMC before 25.5.0
Summary
A Stored HTML Injection vulnerability was discovered in the Time Machine Snapshot Diff functionality due to improper validation of network traffic data. An unauthenticated attacker can send specially crafted network packets at two different times to inject HTML tags into asset attributes across two snapshots. Exploitation requires a victim to use the Time Machine Snapshot Diff feature on those specific snapshots and perform specific GUI actions, at which point the injected HTML renders in their browser, enabling phishing and open redirect attacks. Full XSS exploitation is prevented by input validation and Content Security Policy. Attack complexity is high due to multiple required conditions.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-12-18 14:31 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation (XSS or 'Cross-site Scripting')
Assigner
References
Impacted products
3 products
| Vendor | Product | Version | |
|---|---|---|---|
| Nozomi Networks | Guardian |
Affected:
0 , < 25.5.0
(semver)
cpe:2.3:a:nozomi_networks:guardian:*:*:*:*:*:*:*:* |
|
| Nozomi Networks | CMC |
Affected:
0 , < 25.5.0
(semver)
cpe:2.3:a:nozomi_networks:cmc:*:*:*:*:*:*:*:* |
|
| Siemens | RUGGEDCOM APE1808 |
Affected:
0 , < *
(custom)
|
Date Public
2025-12-18 08:00
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"cweId": "CWE-79",
"description": "CWE-79 Improper Neutralization of Input During Web Page Generation (XSS or \u0027Cross-site Scripting\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-12-18T13:14:35.366Z",
"orgId": "bec8025f-a851-46e5-b3a3-058e6b0aa23c",
"shortName": "Nozomi"
},
"references": [
{
"url": "https://security.nozominetworks.com/NN-2025:12-01"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cdiv\u003e\u003cdiv\u003eUpgrade to v25.5.0 or later.\u003c/div\u003e\u003c/div\u003e"
}
],
"value": "Upgrade to v25.5.0 or later."
}
],
"source": {
"discovery": "INTERNAL"
},
"title": "HTML injection in in Time Machine functionality in Guardian/CMC before 25.5.0",
"x_generator": {
"engine": "Vulnogram 0.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "bec8025f-a851-46e5-b3a3-058e6b0aa23c",
"assignerShortName": "Nozomi",
"cveId": "CVE-2025-40891",
"datePublished": "2025-12-18T13:14:35.366Z",
"dateReserved": "2025-04-16T09:04:25.006Z",
"dateUpdated": "2026-08-11T12:22:50.510Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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.
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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.
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