External risk intelligence

OpenMAIC Non-Production Build Server-Side Request Forgery Leads to Cloud Credential Exposure.

CVE advisorySeverity: CRITICAL (CVSS 9.0)

CVE-2026-86259

The vulnerability is specifically limited to non-production builds of the software, which are intended for internal development and testing environments rather than public-facing deployment.

Missing Authentication

Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A vulnerability in OpenMAIC, specifically in non-production builds prior to version 1.0.1, allows unauthenticated attackers to access sensitive cloud credentials and metadata by bypassing server-side request forgery validation. This issue arises from the ability to manipulate URLs through specific headers or parameters, potentially exposing critical cloud environment information. The main concern is confirming relevance and exposure due to the vulnerability's limitation to non-production builds.

Vulnerability allows unauthorized access to cloud credentials.
Non-production builds are the primary concern.
Confirm relevance and potential exposure to cloud environments.

Attack Path

How an attacker could exploit the issue

Attackers can reach sensitive cloud credentials by sending specially crafted requests to non-production builds of OpenMAIC. These requests, facilitated by bypassing server-side request forgery validation through the `x-base-url` header or `baseUrl` parameter, can cause the application to interact with cloud instance metadata services. This interaction can expose cloud credentials and other sensitive metadata, potentially allowing an attacker to gain further access or control over cloud resources.

Unauthenticated attackers can access the service.
Attackers provide malicious URLs.
Exposed cloud credentials and metadata.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability could expose sensitive cloud credentials and metadata by allowing unauthenticated attackers to bypass server-side request forgery validation in non-production builds. When supported by the advisory, attackers can supply arbitrary provider URLs to access this information.

Cloud credentials and metadata at risk.
Attacker supplies arbitrary provider URLs.
Unauthorized access to sensitive information.

Operational Fix

Recommended remediation, mitigation, and detection steps

Given that this vulnerability affects non-production builds of OpenMAIC, the primary responsibility for triage and remediation likely falls to development or platform engineering teams responsible for these environments. The immediate first step is to identify all instances of OpenMAIC, confirm if any non-production builds are accessible externally or contain sensitive data, and then engage the development team to understand the upgrade path or apply necessary configurations.

Development and Platform Engineering teams own this.
Verify non-production builds are not exposed.
Plan upgrades for affected environments.

Supplementary metadata

CVSS vector

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Frequently asked questions

What is OpenMAIC?

OpenMAIC is a software project, often used in research or development contexts, that generates images. The affected versions include code pathways intended for testing or non-production use cases. These builds are typically utilized by developers during the software lifecycle rather than for standard end-user applications.

How does CVE-2026-86259 work?

This vulnerability is a Server-Side Request Forgery (SSRF) and a missing authentication issue. It occurs when the software fails to properly check incoming requests in non-production builds. By supplying a malicious URL through specific parameters, an attacker can trick the application into making unauthorized requests to internal cloud services that store sensitive instance metadata and credentials.

What triggers this SSRF vulnerability?

An unauthenticated user triggers the bug by sending a crafted network request to an affected OpenMAIC build, specifically manipulating the x-base-url header or the baseUrl parameter. The vulnerability does not trigger in production-ready builds or environments where these specific non-production configurations are disabled or absent.

Is my environment at risk from this CVE?

Halo Surface Signal indicates that the risk is very unlikely for most public-facing systems because this flaw is isolated to non-production builds. You should primarily focus on identifying any test, staging, or development environments where these non-production builds might be reachable from a network that could be accessed by untrusted parties.

How should I respond to CVE-2026-86259?

Start by auditing your infrastructure to locate any instances of OpenMAIC running non-production configurations. Ensure these builds are not exposed to the public internet. Coordinate with your development or platform engineering teams to verify if you are using an affected version and upgrade to version 1.0.1 or later to remove the vulnerable code path.

References

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.