Vulnerability-Lookup

FKIE_CVE-2026-94393

Vulnerability from fkie_nvd - Published: 2026-09-21 14:17 - Updated: 2026-09-21 16:17

Severity

6.4 (Medium) - 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

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

References

	URL	Tags
	5a6e4751-2f3f-4070-9419-94fb35b644e8	https://github.com/MISP/MISP/commit/43665b9bb

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "modules": [
            "app/Model/EventReport.php"
          ],
          "product": "MISP",
          "programFiles": [
            "app/Model/EventReport.php"
          ],
          "repo": "https://github.com/MISP/MISP",
          "vendor": "MISP",
          "versions": [
            {
              "lessThan": "2.5.47",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "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"
    }
  ],
  "id": "CVE-2026-94393",
  "lastModified": "2026-09-21T16:17:30.677",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.4,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
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            },
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              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
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          "role": "CISA Coordinator",
          "timestamp": "2026-09-21T15:18:01.147790Z",
          "version": "2.0.3"
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  "published": "2026-09-21T14:17:30.500",
  "references": [
    {
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
      "url": "https://github.com/MISP/MISP/commit/43665b9bb"
    }
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  "sourceIdentifier": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        },
        {
          "lang": "en",
          "value": "CWE-639"
        }
      ],
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
      "type": "Secondary"
    }
  ]
}

CVE-2026-94393 (GCVE-0-2026-94393)

Vulnerability from cvelistv5 – Published: 2026-09-21 13:14 – Updated: 2026-09-21 15:18

Title

MISP Event Report Cross-Event Reparenting via Unscoped UUID Resolution in editReport

Summary

Severity

6.4 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-21 15:18 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key
CWE-284 - Improper Access Control

Assigner

CIRCL ENISA root

References

1 reference

URL	Tags
https://github.com/MISP/MISP/commit/43665b9bb	patch

Impacted products

1 product

Vendor	Product	Version
MISP	MISP	Affected: 0 , < 2.5.47 (semver)

Credits

iglocska Claude Opus 4.8 David André Jeroen Pinoy

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

Whole record AI-generated Review: review GNA-1

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.py on 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

Show details on NVD website

JSON

To clipboard

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    "dateReserved": "2026-09-21T13:13:54.299Z",
    "dateUpdated": "2026-09-21T15:18:17.855Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.

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.

Action not permitted

FKIE_CVE-2026-94393

CVE-2026-94393 (GCVE-0-2026-94393)

Fix summary

Patch summary

CVSS rationale

Weakness rationale

Attack pattern rationale

Assumptions to verify

Model comparison

Tags

Sightings

Nomenclature

Related by attack behaviour