Avo Gem Critical Vulnerability: Missing Authorization Flaw Confirmed
A critical missing authorization flaw in Avo's association attach workflow allows authenticated low-privileged users to bypass controls and attach records, leading to privilege escalation and cross-tenant data exposure.
What happened
According to the GitHub advisory [GHSA-8fq9-273g-6mrg], a critical vulnerability exists in the Avo gem's association attach endpoint. An authenticated user with low privileges can bypass hidden or disabled attach controls and directly attach related records to a parent record. This flaw enables unauthorized relationship manipulation, privilege escalation, and potential cross-tenant data exposure.
The vulnerability stems from missing authorization checks in the attach workflow. By exploiting this flaw, an attacker can gain elevated privileges and access sensitive data across different tenants. The affected component is the Avo gem, a Ruby gem used for building admin interfaces.
To assess your exposure, check if your application uses the Avo gem. If so, upgrade to the latest version that includes the necessary authorization checks to mitigate this vulnerability. Consult the primary sources for more details on the flaw and recommended remediation steps.
How 0Day mitigates this
avo is anywhere in your dependency tree, the engineers who own the affected repositories get a push alert the moment it is flagged — no manual audit to remember to run.Read how this differs from waiting on a scanner to catch a known advisory, or see the exact, read-only access 0Day needs to do this for an organization.