FKIE_CVE-2026-55518

Vulnerability from fkie_nvd - Published: 2026-07-17 21:17 - Updated: 2026-07-23 17:58
Severity
9.6 (Critical) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Summary
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_<association>? 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.
References
security-advisories@github.comhttps://github.com/avo-hq/avo/commit/995928e586fd1788dd496bd51c4dbe4a79cb2b9c
security-advisories@github.comhttps://github.com/avo-hq/avo/pull/4568
security-advisories@github.comhttps://github.com/avo-hq/avo/releases/tag/v3.32.1
security-advisories@github.comhttps://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "avo",
          "vendor": "avo-hq",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 4.0.0.beta.1, \u003c 4.0.0.beta.51"
            },
            {
              "status": "affected",
              "version": "\u003c 3.32.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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\u0027s 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",
  "lastModified": "2026-07-23T17:58:34.990",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 9.6,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.1,
        "impactScore": 5.8,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-55518",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-20T15:18:54.194227Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-17T21:17:09.173",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/avo-hq/avo/commit/995928e586fd1788dd496bd51c4dbe4a79cb2b9c"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/avo-hq/avo/pull/4568"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/avo-hq/avo/releases/tag/v3.32.1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-639"
        },
        {
          "lang": "en",
          "value": "CWE-862"
        },
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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