CVE-2026-55518
published 2026-07-17CVE-2026-55518: 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_? in the…
PriorityP260critical9.6CVSS 3.1
AVNACLPRLUINSCCHIHAN
EPSS
0.45%
36.2th percentile
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_? 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
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| avo-hq | avo | < 3.32.1 | 3.32.1 |
| avo-hq | avo | — | — |
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VulDB
avo-hq Avo up to 3.32.0/4.0.0.beta.50 Write Endpoint associations_controller.rb create improper authorization
vuldb·2026-07-17·CVSS 9.6
CVE-2026-55518 [CRITICAL] avo-hq Avo up to 3.32.0/4.0.0.beta.50 Write Endpoint associations_controller.rb create improper authorization
A vulnerability was found in avo-hq Avo up to 3.32.0/4.0.0.beta.50. It has been classified as critical. This impacts the function create of the file app/controllers/avo/associations_controller.rb of the component Write Endpoint. This manipulation causes improper authorization.
This vulnerability appears as CVE-2026-55518. The attack may be initiated remotely. There is no available exploit.
GHSA
Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation
ghsa·2026-06-17
CVE-2026-55518 [CRITICAL] CWE-639 Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation
Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation
## Summary
A critical missing authorization flaw exists in Avo's association attach workflow. The UI and `GET /resources/:resource/:id/:related/new` path can check `attach_?`, but the actual write endpoint, `POST /resources/:resource/:id/:related`, does not run the same authorization check before mutating the association.
As a result, an authenticated low-privileged Avo user can bypass hidden/disabled attach controls and directly attach related records to a parent record by sending a crafted POST request. In applications where associations represent teams, tenants, roles, projects, users, memberships, ownership, or other authorization-bearing relationships
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://github.com/avo-hq/avo/commit/995928e586fd1788dd496bd51c4dbe4a79cb2b9chttps://github.com/avo-hq/avo/pull/4568https://github.com/avo-hq/avo/releases/tag/v3.32.1https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrghttps://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg
2026-07-17
Published