Avo: Missing Authorization in Avo Association Attach Endpoint Allows Unauthorized Relationship Manipulation and Privilege Escalation — CVE-2026-55518

Summary

## 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_<association>?`, 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…

Product

rubygems: avo

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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