Vulnerability-Lookup

FKIE_CVE-2026-91825

Vulnerability from fkie_nvd - Published: 2026-09-15 09:16 - Updated: 2026-09-16 13:42

Severity

7.1 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

Summary

Affected versions of MISP fail to authorize a submitted sharing group in a specific event-edit path. The vulnerable logic checked whether the acting user could use a sharing_group_id only when the request explicitly supplied distribution = 4. If the attacker instead omitted distribution but supplied a different sharing_group_id, that authorization branch was skipped. Later, MISP’s field-recovery logic restored the existing event distribution from storage. For events already configured with sharing-group distribution, the unauthorized sharing-group ID could therefore be saved. The fix adds authorization checks in both the controller and Event::_edit() whenever a non-empty sharing_group_id is supplied without distribution. The model now calls SharingGroup::checkIfAuthorised() before persisting the change. Version affected: ≤2.5.45

References

	URL	Tags
	5a6e4751-2f3f-4070-9419-94fb35b644e8	https://github.com/MISP/MISP/commit/cf3ee4026

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "modules": [
            "EventsController (edit action)",
            "Event model (_edit method)"
          ],
          "product": "MISP",
          "programFiles": [
            "app/Controller/EventsController.php",
            "app/Model/Event.php"
          ],
          "repo": "https://github.com/MISP/MISP",
          "vendor": "MISP",
          "versions": [
            {
              "lessThan": "2.5.46",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Affected versions of MISP fail to authorize a submitted sharing group in a specific event-edit path.\n\n\nThe vulnerable logic checked whether the acting user could use a sharing_group_id only when the request explicitly supplied distribution = 4. If the attacker instead omitted distribution but supplied a different sharing_group_id, that authorization branch was skipped. Later, MISP\u2019s field-recovery logic restored the existing event distribution from storage. For events already configured with sharing-group distribution, the unauthorized sharing-group ID could therefore be saved.\n\n\nThe fix adds authorization checks in both the controller and Event::_edit() whenever a non-empty sharing_group_id is supplied without distribution. The model now calls SharingGroup::checkIfAuthorised() before persisting the change.\n\n\n\nVersion affected: \u22642.5.45"
    }
  ],
  "id": "CVE-2026-91825",
  "lastModified": "2026-09-16T13:42:48.460",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "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": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/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": "LOW",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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        "ssvcData": {
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          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-15T13:59:42.790533Z",
          "version": "2.0.3"
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  "published": "2026-09-15T09:16:45.540",
  "references": [
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  "sourceIdentifier": "5a6e4751-2f3f-4070-9419-94fb35b644e8",
  "vulnStatus": "Deferred",
  "weaknesses": [
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        {
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          "value": "CWE-862"
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      "type": "Secondary"
    }
  ]
}

CVE-2026-91825 (GCVE-0-2026-91825)

Vulnerability from cvelistv5 – Published: 2026-09-15 08:06 – Updated: 2026-09-15 14:19

Title

MISP: Missing Authorization Check for Event Sharing Group When Distribution Field Is Omitted During Edit

Summary

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-15 13:59 UTC

CWE

CWE-862 - Missing Authorization

Assigner

CIRCL ENISA root

References

1 reference

URL	Tags
https://github.com/MISP/MISP/commit/cf3ee4026	patch

Impacted products

1 product

Vendor	Product	Version
MISP	MISP	Affected: 0 , < 2.5.46 (semver)

Credits

iglocska Claude Opus 5 (1M context)

GCVE extensions

AI-generated Confidence: high 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 2026-09-15 07:50
Model: qwen3.8:27b
Input: https://github.com/MISP/MISP/commit/cf3ee4026.patch 5229e7ba08a4…
Confidence: high

Commit	Subject	Patch SHA-256
`cf3ee40265ee`	fix: [security] Authorise the event sharing group when	`5229e7ba08a4…`

Fix summary

The fix adds an explicit authorization check for the sharing_group_id in the code path where the distribution field is omitted from the edit request. In the controller, if no distribution is submitted but a sharing_group_id is present and differs from the stored value, the user's access to that sharing group is verified via checkIfCanBeUsed before the edit proceeds. In the model's _edit method, a parallel check via checkIfAuthorised is added for the same condition, returning an error if the user is not authorized for the submitted sharing group. This closes the gap where omitting the distribution field bypassed the existing authorization gate.

Patch summary

Two files are modified with 25 lines of insertions. In EventsController.php (edit method), a new else-if branch is added after the existing distribution-handling logic: when distribution is not set, sharing_group_id is non-empty, and it differs from the stored value, the code calls SharingGroup->checkIfCanBeUsed() and throws MethodNotAllowedException on failure. In Event.php (_edit method), a new elseif branch is added for the case where distribution is not set in the submitted data but sharing_group_id is present; it calls SharingGroup->checkIfAuthorised() and returns an error array if the user lacks access. Both additions are narrowly scoped to the omitted-distribution path and do not alter behavior for explicitly stated non-4 distribution values.

CVSS rationale

AV:N: MISP is a network-accessible web application. AC:L: The attack requires only omitting a field from a standard edit request; no race condition or complex manipulation is needed. AT:N: No prior user interaction or attack preparation is required. PR:L: The attacker must be an authenticated user with edit access to at least one event. UI:N: No victim interaction is needed. VC:L: Event data may be exposed to members of the unauthorized sharing group. VI:H: The event's sharing group assignment is modified without authorization, directly compromising data integrity. VA:N: No availability impact. SC/SI/SA: No secondary system impact is evidenced; the impact is confined to the MISP instance's data integrity and the confidentiality of the affected event record.

Weakness rationale

CWE-862 The authorization check for the sharing_group_id was conditionally executed only when the distribution field was explicitly set to 4. By omitting the distribution field, an attacker bypassed the authorization gate entirely, allowing an unauthorized sharing group assignment to be persisted. The check existed but was not applied to all code paths that could result in the sharing group being saved.

Assumptions to verify

The affected version range is inferred from the tag_version_boundary (v2.5.46 with 216 commits after fix); no explicit fixed version tag is provided in the metadata, so the boundary is approximate.
The attacker must already possess authenticated edit access to at least one event in MISP; the vulnerability does not grant access to users without any event edit permission.
The impact assessment assumes the unauthorized sharing group contains other users who would gain visibility into the event data; if the target group is empty, the confidentiality impact is reduced.
The patch was found during internal review per the commit message; no external reporter or finder is identified in the metadata.

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`	7	9	high	4

Show details on NVD website

JSON

To clipboard

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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.

Detection rules are retrieved from Rulezet.

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.