Vulnerability 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.
CVSS Score
CRITICAL
Related Weaknesses (CWE)
References
- https://github.com/avo-hq/avo/commit/995928e586fd1788dd496bd51c4dbe4a79cb2b9c
- https://github.com/avo-hq/avo/pull/4568
- https://github.com/avo-hq/avo/releases/tag/v3.32.1
- https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg
- https://github.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg
FAQ
What is CVE-2026-55518?
CVE-2026-55518 is a vulnerability with a CVSS score of 9.6 (CRITICAL). 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/:resour...
How severe is CVE-2026-55518?
CVE-2026-55518 has been rated CRITICAL with a CVSS base score of 9.6/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-55518?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.