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MISP Correlation Authorization Bypass Exposes Restricted Event and Attribute Data

Type: advisorySources: OSV

MISP contains an authorization flaw in its correlation handling during attribute searches. When a user performs an attribute search that triggers correlation lookups, the system authorized access to correlated attributes and events based on a stale distribution snapshot stored on the correlation row rather than the live event access control list. Because the correlation row's distribution columns are a point-in-time copy that lacks a published flag, the authorization check becomes incorrect when an event is subsequently restricted (for example, its sharing group is changed or it is unpublished). As a result, an authenticated user could retrieve attributes and event details belonging to events they no longer have permission to view. Preconditions: - An authenticated user with at least read access to some events in the instance. - The existence of correlations between events, at least one of which has been restricted after the correlation was created. Impact: - Confidentiality: exposure of attribute values and event metadata that the user is not authorized to access. Affected versions: MISP prior to v2.5.48.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-104912
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 10:54 UTC · Revision 1

Source evidence

MISP Correlation Authorization Bypass Exposes Restricted Event and Attribute Data

core-osv · Original source

Published 2 Oct 2026, 16:04 UTC

MISP contains an authorization flaw in its correlation handling during attribute searches. When a user performs an attribute search that triggers correlation lookups, the system authorized access to correlated attributes and events based on a stale distribution snapshot stored on the correlation row rather than the live event access control list. Because the correlation row's distribution columns are a point-in-time copy that lacks a published flag, the authorization check becomes incorrect when an event is subsequently restricted (for example, its sharing group is changed or it is unpublished). As a result, an authenticated user could retrieve attributes and event details belonging to events they no longer have permission to view. Preconditions: - An authenticated user with at least read access to some events in the instance. - The existence of correlations between events, at least one of which has been restricted after the correlation was created. Impact: - Confidentiality: exposure of attribute values and event metadata that the user is not authorized to access. Affected versions: MISP prior to v2.5.48.

osv:CVE-2026-104912
Complete source record
{
  "id": "3ab67029baafaf1dfbc17d62f88c0c8f1906ffb443755d62bf0ce72d2b8b06ed",
  "url": "https://osv.dev/vulnerability/CVE-2026-104912",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MISP Correlation Authorization Bypass Exposes Restricted Event and Attribute Data",
    "summary": "MISP contains an authorization flaw in its correlation handling during attribute searches. When a user performs an attribute search that triggers correlation lookups, the system authorized access to correlated attributes and events based on a stale distribution snapshot stored on the correlation row rather than the live event access control list. Because the correlation row's distribution columns are a point-in-time copy that lacks a published flag, the authorization check becomes incorrect when an event is subsequently restricted (for example, its sharing group is changed or it is unpublished). As a result, an authenticated user could retrieve attributes and event details belonging to events they no longer have permission to view. Preconditions: - An authenticated user with at least read access to some events in the instance. - The existence of correlations between events, at least one of which has been restricted after the correlation was created. Impact: - Confidentiality: exposure of attribute values and event metadata that the user is not authorized to access. Affected versions: MISP prior to v2.5.48.",
    "evidence": "osv:CVE-2026-104912",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-104912",
      "aliases": [
        "CVE-2026-104912"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/misp/misp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "63d46c54ccccd646fa352ee74d218f618ccce75b"
                },
                {
                  "fixed": "100235bd9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.5.48"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "100235bd9"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.5.47",
            "v2.5.46",
            "v2.5.45",
            "v2.5.44",
            "v2.5.43",
            "v2.5.42",
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            "v2.5.19",
            "v2.5.18",
            "v2.5.17",
            "v2.5.16",
            "v2.5.15",
            "v2.5.12",
            "v2.5.14",
            "v2.5.13",
            "v2.5.11",
            "v2.5.10",
            "v2.5.9",
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            "v2.5.0",
            "v2.4.196",
            "v2.4.195",
            "v2.4.194",
            "v2.4.193",
            "v2.4.192",
            "v2.4.191",
            "v2.4.190",
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            "v2.4.188",
            "v2.4.187",
            "v2.4.186",
            "v2.4.175",
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            "v2.4.183",
            "v2.4.184",
            "v2.4.153",
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            "v2.4.109",
            "codename/tellurium",
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            "v2.4.101",
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            "v2.4.95",
            "v2.4.94",
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            "v2.4.25",
            "v2.4.24",
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            "v2.4.2",
            "v2.4.1",
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            "v2.3.0",
            "v0.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-104912.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.982016854Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104912.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-104912",
        "https://github.com/MISP/MISP/commit/100235bd9",
        "https://github.com/MISP/MISP"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-284",
          "CWE-862"
        ],
        "cna_assigner": "CIRCL",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/104xxx/CVE-2026-104912.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-104912",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494753,
  "published_at": "2026-10-02T16:04:50.58+00:00"
}