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CVE-2026-55518

9.6 · CRITICAL

Avo is a framework to create admin panels for Ruby on Rails apps.

Published Jul 17, 2026CWE-639EPSS 0.45%

Overview

CVE-2026-55518 is a critical-severity vulnerability. It was published on July 17, 2026 and has a CVSS 3.1 base score of 9.6 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.6, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/avo-hq/avo/commit/995928e586fd1788dd496bd51c4dbe4a79cb2b9cGitHubgithub.com/avo-hq/avo/pull/4568GitHubgithub.com/avo-hq/avo/releases/tag/v3.32.1GitHubgithub.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrgGitHubgithub.com/avo-hq/avo/security/advisories/GHSA-8fq9-273g-6mrg

How CyberStrike helps

Frequently asked questions

What is CVE-2026-55518?

CVE-2026-55518 is a critical-severity vulnerability. It was published on July 17, 2026 and has a CVSS 3.1 base score of 9.6 (CRITICAL).

How severe is CVE-2026-55518?

This vulnerability has a CVSS 3.1 base score of 9.6, rated CRITICAL. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-55518?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-55518?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-55518 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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