FKIE_CVE-2026-82438
Vulnerability from fkie_nvd - Published: 2026-09-14 15:17 - Updated: 2026-09-14 20:58
Severity
Summary
Description
Three separate mechanisms allowed a web page on an unrelated origin to read responses that Storm's HTTP
components served to an authenticated user.
The Logviewer reflected the request's `Origin` header back in `Access-Control-Allow-Origin` while also
sending `Access-Control-Allow-Credentials: true`. The published security model documents a permissive
`Access-Control-Allow-Origin: *` posture as accepted, which is safe precisely because browsers refuse to
honour `*` together with credentials; reflecting the concrete origin removes that protection.
The shared CORS filter used by the UI, the Logviewer and DRPC was configured with a response header name
where an initialisation parameter name was expected. The container ignored the setting and applied its own
defaults, which allow credentials.
Finally, the UI and Logviewer wrapped API responses in a caller-supplied JSONP callback for every GET
request. A script element on any origin can load such a response, which bypasses the same-origin policy
entirely rather than negotiating it, and there was no way to turn the behaviour off.
In each case the effect is that a page visited by an authenticated operator can read cluster, topology and
log data on their behalf.
Mitigation
Upgrade to 3.1.0, where the Logviewer no longer reflects the request origin in a credentialed response, the
CORS filter is configured explicitly, and JSONP wrapping is governed by `ui.enable.jsonp`, which defaults to
false.
Note that disabling JSONP is a behaviour change for tooling that passes a `callback` query parameter; such
tooling should be moved to ordinary JSON requests.
Users who cannot upgrade immediately should place the UI, Logviewer and DRPC HTTP endpoints behind a reverse
proxy that strips `Access-Control-Allow-Origin` and `Access-Control-Allow-Credentials` from responses and
rejects requests carrying a `callback` parameter.
Credit
The ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"collectionURL": "https://repo.maven.apache.org/maven2",
"defaultStatus": "unaffected",
"packageName": "org.apache.storm:storm-webapp",
"product": "Apache Storm Webapp",
"vendor": "Apache Software Foundation",
"versions": [
{
"lessThan": "3.1.0",
"status": "affected",
"version": "3.0.0",
"versionType": "semver"
}
]
}
],
"source": "security@apache.org"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Description\n\nThree separate mechanisms allowed a web page on an unrelated origin to read responses that Storm\u0027s HTTP\ncomponents served to an authenticated user.\n\nThe Logviewer reflected the request\u0027s `Origin` header back in `Access-Control-Allow-Origin` while also\nsending `Access-Control-Allow-Credentials: true`. The published security model documents a permissive\n`Access-Control-Allow-Origin: *` posture as accepted, which is safe precisely because browsers refuse to\nhonour `*` together with credentials; reflecting the concrete origin removes that protection.\n\nThe shared CORS filter used by the UI, the Logviewer and DRPC was configured with a response header name\nwhere an initialisation parameter name was expected. The container ignored the setting and applied its own\ndefaults, which allow credentials.\n\nFinally, the UI and Logviewer wrapped API responses in a caller-supplied JSONP callback for every GET\nrequest. A script element on any origin can load such a response, which bypasses the same-origin policy\nentirely rather than negotiating it, and there was no way to turn the behaviour off.\n\nIn each case the effect is that a page visited by an authenticated operator can read cluster, topology and\nlog data on their behalf.\n\nMitigation\n\nUpgrade to 3.1.0, where the Logviewer no longer reflects the request origin in a credentialed response, the\nCORS filter is configured explicitly, and JSONP wrapping is governed by `ui.enable.jsonp`, which defaults to\nfalse.\n\nNote that disabling JSONP is a behaviour change for tooling that passes a `callback` query parameter; such\ntooling should be moved to ordinary JSON requests.\n\nUsers who cannot upgrade immediately should place the UI, Logviewer and DRPC HTTP endpoints behind a reverse\nproxy that strips `Access-Control-Allow-Origin` and `Access-Control-Allow-Credentials` from responses and\nrejects requests carrying a `callback` parameter.\n\nCredit\n\nThe ASF -- found using Claude agents to study the security of open-source projects, validated and reported by Apache Storm."
}
],
"id": "CVE-2026-82438",
"lastModified": "2026-09-14T20:58:48.430",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
"version": "3.1"
},
"exploitabilityScore": 2.8,
"impactScore": 5.2,
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2026-82438",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-09-14T19:52:29.973602Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-09-14T15:17:10.900",
"references": [
{
"source": "security@apache.org",
"url": "https://lists.apache.org/thread/2o7tl3hcdd865njxsn4d9cxp1frkctz3"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"url": "http://www.openwall.com/lists/oss-security/2026/09/13/17"
}
],
"sourceIdentifier": "security@apache.org",
"vulnStatus": "Deferred",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-346"
},
{
"lang": "en",
"value": "CWE-942"
}
],
"source": "security@apache.org",
"type": "Secondary"
}
]
}
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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.
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.
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