CVE-2026-55518

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{"affected": [{"affectedData": [{"product": "avo", "vendor": "avo-hq", "versions": [{"status": "affected", "version": ">= 4.0.0.beta.1, < 4.0.0.beta.51"}, {"status": "affected", "version": "< 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'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."}, {"lang": "es", "value": "Avo es un framework para crear paneles de administraci\u00f3n para aplicaciones Ruby on Rails. Antes de 3.32.1 y 4.0.0.beta.51, el flujo de trabajo de adjuntar asociaciones de Avo verifica attach_[association]? en la UI y la ruta GET /resources/:resource/:id/:related/new, pero el endpoint de escritura real, POST /resources/:resource/:id/:related, no ejecuta la misma verificaci\u00f3n de autorizaci\u00f3n antes de mutar la asociaci\u00f3n a trav\u00e9s de Avo::AssociationsController#create. Un usuario de Avo autenticado con bajos privilegios puede eludir los controles de adjuntar ocultos o deshabilitados y adjuntar directamente registros relacionados a un registro padre enviando una solicitud POST manipulada, lo que puede llevar a una escalada de privilegios y exposici\u00f3n de datos entre inquilinos donde las asociaciones representan relaciones que conllevan autorizaci\u00f3n. Este problema est\u00e1 solucionado en las versiones 3.32.1 y 4.0.0.beta.51."}], "id": "CVE-2026-55518", "lastModified": "2026-10-24T20:10:00.137", "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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