CVE-2026-94393 (GCVE-0-2026-94393)
Vulnerability from cvelistv5 – Published: 2026-09-21 13:14 – Updated: 2026-09-21 15:18
VLAI
EPSS
VEX
Title
MISP Event Report Cross-Event Reparenting via Unscoped UUID Resolution in editReport
Summary
When a user creates or edits a report inside an event, MISP can identify an existing report using its UUID without properly checking whether that report actually belongs to the same event.
As a result, a user who has editing rights on one event could potentially move a report from another event into their own event, as long as they know or can guess the report’s UUID. Once moved, they could view and change information that they were not originally allowed to access.
The vulnerability requires the attacker to have editor access to at least one event and to know or discover a valid report UUID.
The main impact is that private event reports could be exposed or modified across event boundaries, bypassing MISP’s normal access restrictions.
Version affected: <2.5.47
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 15:18 UTC
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/MISP/MISP/commit/43665b9bb | patch |
Impacted products
GCVE extensions
AI-generated
Confidence: medium
Model
qwen3.8:27b
advisory
bcp-05-x-01bcp-05-x-02
AI involvement
GCVE-BCP-05-X-01
Draft vulnerability metadata was generated from a git-format patch using an Ollama-hosted language model. Human validation is required before publication.
ai-computer-assisted:llm-generatedai-computer-assisted:classification
| Model | Source | Identifier |
|---|---|---|
| qwen3.8:27b | ollama | qwen3.8:27b |
Patch provenance
GCVE-BCP-05-X-02
- Generator
-
patch2vuln.pyon 2026-09-21 13:01 - Model
qwen3.8:27b- Input
-
https://github.com/MISP/MISP/commit/43665b9bb.patch
2306bd95d16b… - Confidence
- medium
| Commit | Subject | Patch SHA-256 |
|---|---|---|
43665b9bb6bd
|
fix: [security] Refuse to adopt an event report that belongs | 2306bd95d16b… |
Fix summary
The fix adds an ownership check in editReport: before adopting an existing report found by UUID, the code now verifies that the report's event_id matches the event being edited. If the UUID resolves to a report belonging to a different event, the operation is rejected with an error message, preventing cross-event reparenting, unauthorized read, and unauthorized overwrite of reports.
Patch summary
In app/Model/EventReport.php, the editReport method's else-branch (handling an existing report found by UUID) now includes an 11-line guard: it compares (string)$existingReport['EventReport']['event_id'] against (string)$eventId and, on mismatch, appends an error string and returns early, preventing the subsequent assignment of the foreign report's ID to the current event's report record.
CVSS rationale
AV:N: MISP is a network-accessible web application. AC:L: the attacker only needs to supply a known/guessed UUID in a standard edit request; no race or complex condition. AT:N: no manipulation of the target environment is required. PR:L: the attacker must be an authenticated user with editor role on at least one event. UI:N: no victim interaction is needed. VC:N/VI:N/VA:N: the MISP application itself (its configuration, credentials, availability) is not directly impacted. SC:H: the attacker gains read access to private report data in events they cannot otherwise see. SI:H: the attacker can overwrite and modify report data belonging to other events. SA:N: no safety-system impact.
Weakness rationale
- CWE-639 The report UUID is a user-controlled key resolved globally without scoping to the caller's event context. The system failed to verify that the referenced object (report) belongs to the event the caller is authorized to edit, allowing cross-event access.
- CWE-284 The broader category applies: MISP's per-event access control model was bypassed because the editReport path did not enforce that a report UUID maps to the same event the caller is operating on.
Attack pattern rationale
- CAPEC-174 The edge case of a UUID belonging to a different event was not handled: the code assumed any UUID found in the global table belonged to the current event. The attacker exploits this unhandled edge case to reparent a foreign report. This is the closest CAPEC; a more specific 'IDOR' or 'broken object reference' CAPEC does not exist in the CAPEC catalog, so CAPEC-174 is the best available match.
Assumptions to verify
- The affected version range is inferred from the tag_version_boundary (v2.5.47, 56 commits after fix); the exact first affected and first fixed release versions are not stated in the patch and are marked unspecified.
- PR:L assumes the attacker needs at minimum editor-level access to one event; the patch does not specify whether viewer-level access could also trigger the code path, but the commit message explicitly references 'an event editor'.
- CAPEC-174 is selected as the closest available attack pattern; no CAPEC entry specifically covers IDOR or broken object reference resolution, so the mapping is approximate.
- The CVSS sub-component impact (SC:H, SI:H) assumes the event report data constitutes a distinct data asset whose confidentiality and integrity are the primary impact, rather than the MISP application's own state.
- The commit date (2026-09-16) and tag boundary are taken at face value from the supplied metadata; no independent verification of release timing was performed.
Model comparison
Selected qwen3.8:27b
by deterministic-consensus-v1
The selected result is closest to model consensus; this heuristic does not establish factual correctness and human review remains required.
| Model | Score | Agreement | Confidence | Assumptions |
|---|---|---|---|---|
qwen3.8:27b |
5 | 9 | medium | 5 |
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"type": "text/html",
"value": "\u003cdiv\u003e\u003c/div\u003e\u003cp\u003eWhen a user creates or edits a report inside an event, MISP can identify an existing report using its UUID without properly checking whether that report actually belongs to the same event.\u003c/p\u003e\u003cp\u003eAs a result, a user who has editing rights on one event could potentially move a report from another event into their own event, as long as they know or can guess the report\u2019s UUID. Once moved, they could view and change information that they were not originally allowed to access.\u003c/p\u003e\u003cp\u003eThe vulnerability requires the attacker to have editor access to at least one event and to know or discover a valid report UUID.\u003c/p\u003e\u003cp\u003eThe main impact is that private event reports could be exposed or modified across event boundaries, bypassing MISP\u2019s normal access restrictions.\u003c/p\u003e\u003cp\u003eVersion affected: \u0026lt;2.5.47\u003c/p\u003e\u003cdiv\u003e\u003c/div\u003e"
}
],
"value": "When a user creates or edits a report inside an event, MISP can identify an existing report using its UUID without properly checking whether that report actually belongs to the same event.\n\nAs a result, a user who has editing rights on one event could potentially move a report from another event into their own event, as long as they know or can guess the report\u2019s UUID. Once moved, they could view and change information that they were not originally allowed to access.\n\nThe vulnerability requires the attacker to have editor access to at least one event and to know or discover a valid report UUID.\n\nThe main impact is that private event reports could be exposed or modified across event boundaries, bypassing MISP\u2019s normal access restrictions.\n\nVersion affected: \u003c2.5.47"
}
],
"impacts": [
{
"capecId": "CAPEC-174",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-174 Exploiting Incorrectly Handled Edge Cases"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 6.4,
"baseSeverity": "MEDIUM",
"privilegesRequired": "LOW",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "HIGH",
"subIntegrityImpact": "HIGH",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-639",
"description": "CWE-639 Authorization Bypass Through User-Controlled Key",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-284",
"description": "CWE-284 Improper Access Control",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-21T13:14:00.619Z",
"orgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
"shortName": "CIRCL"
},
"references": [
{
"name": "Security patch",
"tags": [
"patch"
],
"url": "https://github.com/MISP/MISP/commit/43665b9bb"
}
],
"solutions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eThe fix adds an ownership check in editReport: before adopting an existing report found by UUID, the code now verifies that the report\u0027s event_id matches the event being edited. If the UUID resolves to a report belonging to a different event, the operation is rejected with an error message, preventing cross-event reparenting, unauthorized read, and unauthorized overwrite of reports.\u003c/p\u003e"
}
],
"value": "The fix adds an ownership check in editReport: before adopting an existing report found by UUID, the code now verifies that the report\u0027s event_id matches the event being edited. If the UUID resolves to a report belonging to a different event, the operation is rejected with an error message, preventing cross-event reparenting, unauthorized read, and unauthorized overwrite of reports."
}
],
"title": "MISP Event Report Cross-Event Reparenting via Unscoped UUID Resolution in editReport",
"x_gcve": [
{
"extensions": {
"bcp-05-x-01": {
"ai_annotations": [
{
"ai_level": "generated",
"description": "Draft vulnerability metadata was generated from a git-format patch using an Ollama-hosted language model. Human validation is required before publication.",
"gna_source": 1,
"models": [
{
"gna_source": 1,
"identifier": "qwen3.8:27b",
"name": "qwen3.8:27b",
"source": "ollama"
}
],
"review_status": "review",
"scope": "record",
"tags": [
"ai-computer-assisted:llm-generated",
"ai-computer-assisted:classification"
]
}
]
},
"bcp-05-x-02": {
"x_patch2vuln": {
"assumptions": [
"The affected version range is inferred from the tag_version_boundary (v2.5.47, 56 commits after fix); the exact first affected and first fixed release versions are not stated in the patch and are marked unspecified.",
"PR:L assumes the attacker needs at minimum editor-level access to one event; the patch does not specify whether viewer-level access could also trigger the code path, but the commit message explicitly references \u0027an event editor\u0027.",
"CAPEC-174 is selected as the closest available attack pattern; no CAPEC entry specifically covers IDOR or broken object reference resolution, so the mapping is approximate.",
"The CVSS sub-component impact (SC:H, SI:H) assumes the event report data constitutes a distinct data asset whose confidentiality and integrity are the primary impact, rather than the MISP application\u0027s own state.",
"The commit date (2026-09-16) and tag boundary are taken at face value from the supplied metadata; no independent verification of release timing was performed."
],
"capecRationale": [
{
"capecId": "CAPEC-174",
"rationale": "The edge case of a UUID belonging to a different event was not handled: the code assumed any UUID found in the global table belonged to the current event. The attacker exploits this unhandled edge case to reparent a foreign report. This is the closest CAPEC; a more specific \u0027IDOR\u0027 or \u0027broken object reference\u0027 CAPEC does not exist in the CAPEC catalog, so CAPEC-174 is the best available match."
}
],
"commit": "43665b9bb6bd39af0db1f38e608bdf2cb84b9dec",
"confidence": "medium",
"credits": [
{
"lang": "en",
"type": "remediation developer",
"value": "iglocska"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Claude Opus 4.8"
},
{
"lang": "en",
"type": "reporter",
"value": "David Andr\u00e9"
},
{
"lang": "en",
"type": "reporter",
"value": "Jeroen Pinoy"
}
],
"cvssRationale": "AV:N: MISP is a network-accessible web application. AC:L: the attacker only needs to supply a known/guessed UUID in a standard edit request; no race or complex condition. AT:N: no manipulation of the target environment is required. PR:L: the attacker must be an authenticated user with editor role on at least one event. UI:N: no victim interaction is needed. VC:N/VI:N/VA:N: the MISP application itself (its configuration, credentials, availability) is not directly impacted. SC:H: the attacker gains read access to private report data in events they cannot otherwise see. SI:H: the attacker can overwrite and modify report data belonging to other events. SA:N: no safety-system impact.",
"fixSummary": "The fix adds an ownership check in editReport: before adopting an existing report found by UUID, the code now verifies that the report\u0027s event_id matches the event being edited. If the UUID resolves to a report belonging to a different event, the operation is rejected with an error message, preventing cross-event reparenting, unauthorized read, and unauthorized overwrite of reports.",
"generatedAt": "2026-09-21T13:01:16.364280Z",
"generator": "patch2vuln.py",
"model": "qwen3.8:27b",
"modelComparison": {
"rankings": [
{
"agreementScore": 9,
"assumptionCount": 5,
"confidence": "medium",
"model": "qwen3.8:27b",
"score": 5
}
],
"selectedModel": "qwen3.8:27b",
"selectionMethod": "deterministic-consensus-v1",
"selectionNotice": "The selected result is closest to model consensus; this heuristic does not establish factual correctness and human review remains required."
},
"patchSha256": "2306bd95d16b9c00582997897aa9181253364082a09589640fce576a03beafb4",
"patchSummary": "In app/Model/EventReport.php, the editReport method\u0027s else-branch (handling an existing report found by UUID) now includes an 11-line guard: it compares (string)$existingReport[\u0027EventReport\u0027][\u0027event_id\u0027] against (string)$eventId and, on mismatch, appends an error string and returns early, preventing the subsequent assignment of the foreign report\u0027s ID to the current event\u0027s report record.",
"patchTruncated": false,
"patches": [
{
"commit": "43665b9bb6bd39af0db1f38e608bdf2cb84b9dec",
"patchSha256": "2306bd95d16b9c00582997897aa9181253364082a09589640fce576a03beafb4",
"source": "https://github.com/MISP/MISP/commit/43665b9bb.patch",
"sourceUrl": "https://github.com/MISP/MISP/commit/43665b9bb.patch",
"subject": "fix: [security] Refuse to adopt an event report that belongs"
}
],
"source": "https://github.com/MISP/MISP/commit/43665b9bb.patch",
"subject": "fix: [security] Refuse to adopt an event report that belongs",
"tagVersionBoundary": {
"commits_after_fix": 56,
"repository": "https://github.com/MISP/MISP",
"tag": "v2.5.47",
"version": "2.5.47",
"version_type": "semver"
},
"weaknessRationale": [
{
"cweId": "CWE-639",
"rationale": "The report UUID is a user-controlled key resolved globally without scoping to the caller\u0027s event context. The system failed to verify that the referenced object (report) belongs to the event the caller is authorized to edit, allowing cross-event access."
},
{
"cweId": "CWE-284",
"rationale": "The broader category applies: MISP\u0027s per-event access control model was bypassed because the editReport path did not enforce that a report UUID maps to the same event the caller is operating on."
}
]
}
}
},
"recordType": "advisory",
"vulnId": "GCVE-1-2026-20057"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
"assignerShortName": "CIRCL",
"cveId": "CVE-2026-94393",
"datePublished": "2026-09-21T13:14:00.619Z",
"dateReserved": "2026-09-21T13:13:54.299Z",
"dateUpdated": "2026-09-21T15:18:17.855Z",
"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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