{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "3.32.1"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "995928e586fd1788dd496bd51c4dbe4a79cb2b9c"
            },
            {
              "fixed": "1a8117a1a2a5136de7dc62150f486093f55ae077"
            }
          ],
          "repo": "https://github.com/avo-hq/avo",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-8fq9-273g-6mrg"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-639",
      "CWE-862",
      "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55518.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "introduced": "4.0.0.beta.1"
          },
          {
            "fixed": "4.0.0.beta.51"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "Avo is a framework to create admin panels for Ruby on Rails apps. Prior to 3.32.1 and 4.0.0.beta.51, Avo's association attach workflow checks attach_\u003cassociation\u003e? in the UI and GET /resources/:resource/:id/:related/new path, but the actual write endpoint, POST /resources/:resource/:id/:related, does not run the same authorization check before mutating the association through Avo::AssociationsController#create. An authenticated low-privileged Avo user can bypass hidden or disabled attach controls and directly attach related records to a parent record by sending a crafted POST request, which can lead to privilege escalation and cross-tenant data exposure where associations represent authorization-bearing relationships. This issue is fixed in versions 3.32.1 and 4.0.0.beta.51.",
  "id": "CVE-2026-55518",
  "modified": "2026-08-12T03:51:24.630166831Z",
  "published": "2026-07-17T20:51:19.056Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/avo-hq/avo/releases/tag/v3.32.1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55518.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55518"
    },
    {
      "type": "FIX",
      "url": "https://github.com/avo-hq/avo/commit/995928e586fd1788dd496bd51c4dbe4a79cb2b9c"
    },
    {
      "type": "FIX",
      "url": "https://github.com/avo-hq/avo/pull/4568"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation"
}