Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation

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Summary

CVECVE-2026-55518
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-17 21:17:09 UTC
Updated2026-07-20 16:17:05 UTC
DescriptionAvo 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.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS: 0.003310000 probability, percentile 0.252790000 (date 2026-07-20)

Problem Types: CWE-639 | CWE-862 | CWE-863 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key | CWE-862 CWE-862: Missing Authorization | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
3.1CNADECLARED9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Avo-hq Avo affected >= 4.0.0.beta.1, < 4.0.0.beta.51 Not specified
CNA Avo-hq Avo affected < 3.32.1 Not specified

References

ReferenceSourceLinkTags
github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/avo-hq/avo/pull/4568 [email protected] github.com
github.com/avo-hq/avo/commit/995928e586fd1788dd496bd51c4dbe4a79cb2b9c [email protected] github.com
github.com/avo-hq/avo/releases/tag/v3.32.1 [email protected] github.com
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