CVE-2026-55518

avo-hq · avo

An authorization bypass vulnerability in the Avo framework allows authenticated low-privileged users to perform unauthorized association modifications via the POST /resources/:resource/:id/:related endpoint.

Executive summary

A missing authorization check in the Avo admin framework allows authenticated users to perform unauthorized data modifications, leading to potential privilege escalation and cross-tenant exposure.

Vulnerability

The vulnerability exists because the POST endpoint for association attachment fails to replicate the authorization checks performed by the UI, allowing an authenticated low-privileged user to bypass restrictions and mutate associations directly.

Business impact

This flaw carries a CVSS score of 9.6, reflecting its high potential for severe impact. By manipulating associations, an attacker could escalate privileges or access data belonging to other tenants, leading to significant unauthorized information disclosure and loss of administrative control over the application.

Remediation

Immediate Action: Update the Avo framework to version 3.32.1 or 4.0.0.beta.51 or later.

Proactive Monitoring: Audit application access logs for unexpected POST requests to the /resources/ paths that deviate from normal administrative usage patterns.

Compensating Controls: Restrict access to the Avo administrative panel to trusted IP addresses or require additional multi-factor authentication for administrative sessions until the patch is applied.

Exploitation status

Public Exploit Available: No (exploit_available: false)

Analyst recommendation

Due to the severity of this authorization bypass, organizations using the Avo framework for administrative panels must treat this as a high-priority update. Failure to patch allows any authenticated user to potentially perform actions that should be restricted to administrators.