{"id":"CVE-2026-55518","state":"PUBLISHED","title":"Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation","description":"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.","publishedAt":"2026-07-17T20:51:19.056Z","updatedAt":"2026-07-20T15:20:34.406Z","severity":{"score":9.6,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["avo-hq avo"],"affected":[{"vendor":"avo-hq","product":"avo","versions":[{"version":">= 4.0.0.beta.1, < 4.0.0.beta.51","status":"affected"},{"version":"< 3.32.1","status":"affected"}]}],"references":["https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg","https://github.com/avo-hq/avo/pull/4568","https://github.com/avo-hq/avo/commit/995928e586fd1788dd496bd51c4dbe4a79cb2b9c","https://github.com/avo-hq/avo/releases/tag/v3.32.1"],"weaknesses":["CWE-639","CWE-862","CWE-863"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55518.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55518","state":"PUBLISHED","datePublished":"2026-07-17T20:51:19.056Z","dateUpdated":"2026-07-20T15:20:34.406Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T22:44:22.284Z"},"containers":{"cna":{"title":"Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation","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'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."}],"affected":[{"vendor":"avo-hq","product":"avo","versions":[{"version":">= 4.0.0.beta.1, < 4.0.0.beta.51","status":"affected"},{"version":"< 3.32.1","status":"affected"}]}],"references":[{"url":"https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg","name":"https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/avo-hq/avo/pull/4568","name":"https://github.com/avo-hq/avo/pull/4568","tags":["x_refsource_MISC"]},{"url":"https://github.com/avo-hq/avo/commit/995928e586fd1788dd496bd51c4dbe4a79cb2b9c","name":"https://github.com/avo-hq/avo/commit/995928e586fd1788dd496bd51c4dbe4a79cb2b9c","tags":["x_refsource_MISC"]},{"url":"https://github.com/avo-hq/avo/releases/tag/v3.32.1","name":"https://github.com/avo-hq/avo/releases/tag/v3.32.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862: Missing Authorization","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-17T20:51:19.056Z"},"source":{"advisory":"GHSA-8fq9-273g-6mrg","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-20T15:18:54.194227Z","id":"CVE-2026-55518","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-20T15:20:34.406Z"}}]}}}