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MISP sharing group creation mass assignment allows unauthorized takeover of existing sharing groups

Type: advisorySources: OSV

A mass assignment vulnerability exists in MISP’s sharing group creation endpoint. When creating a new sharing group, the controller did not remove a user-supplied id field before saving the submitted data. In CakePHP, supplying a primary key in the save data can cause a create() followed by save() operation to update an existing record instead of creating a new one. An authenticated user with permission to add sharing groups could therefore submit the identifier of an existing sharing group and modify that sharing group without passing the normal edit access-control checks. This may allow the attacker to take over or alter sharing groups they do not otherwise have access to, potentially affecting the confidentiality and integrity of information shared through those groups. Affected component: app/Controller/SharingGroupsController.php, add() action

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-54360
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 17:04 UTC · Revision 1

Source evidence

MISP sharing group creation mass assignment allows unauthorized takeover of existing sharing groups

core-osv · Original source

Published 12 Jun 2026, 19:51 UTC

A mass assignment vulnerability exists in MISP’s sharing group creation endpoint. When creating a new sharing group, the controller did not remove a user-supplied id field before saving the submitted data. In CakePHP, supplying a primary key in the save data can cause a create() followed by save() operation to update an existing record instead of creating a new one. An authenticated user with permission to add sharing groups could therefore submit the identifier of an existing sharing group and modify that sharing group without passing the normal edit access-control checks. This may allow the attacker to take over or alter sharing groups they do not otherwise have access to, potentially affecting the confidentiality and integrity of information shared through those groups. Affected component: app/Controller/SharingGroupsController.php, add() action

osv:CVE-2026-54360
Complete source record
{
  "id": "b92e8a07b6bcd387850d60d455e7b8f61a9cbba80b0a13fdbf9328f50d6bad75",
  "url": "https://osv.dev/vulnerability/CVE-2026-54360",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MISP sharing group creation mass assignment allows unauthorized takeover of existing sharing groups",
    "summary": "A mass assignment vulnerability exists in MISP’s sharing group creation endpoint. When creating a new sharing group, the controller did not remove a user-supplied id field before saving the submitted data. In CakePHP, supplying a primary key in the save data can cause a create() followed by save() operation to update an existing record instead of creating a new one. An authenticated user with permission to add sharing groups could therefore submit the identifier of an existing sharing group and modify that sharing group without passing the normal edit access-control checks. This may allow the attacker to take over or alter sharing groups they do not otherwise have access to, potentially affecting the confidentiality and integrity of information shared through those groups. Affected component: app/Controller/SharingGroupsController.php, add() action",
    "evidence": "osv:CVE-2026-54360",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-54360",
      "aliases": [
        "CVE-2026-54360"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/misp/misp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
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                {
                  "fixed": "57ec6febfd1adab7a58038def39a76c19ce0cbeb"
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                  "fixed": "687e7cb530ae0e2faaadf5e3e44712258fb3ef1b"
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              "database_specific": {
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                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
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                    "range": [
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                        "fixed": "687e7cb530ae0e2faaadf5e3e44712258fb3ef1b"
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                    "source": "REFERENCES_COMMIT"
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          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:30.797567531Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54360.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54360",
        "https://github.com/MISP/MISP/commit/687e7cb530ae0e2faaadf5e3e44712258fb3ef1b",
        "https://github.com/misp/misp"
      ],
      "provider_metadata": {
        "cwe_ids": [
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        "cna_assigner": "CIRCL",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54360.json"
      }
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    "related_cves": [
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        "value": "CVE-2026-54360",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497638,
  "published_at": "2026-06-12T19:51:44.187+00:00"
}