External risk intelligence

Azure DevOps Improper Authentication Code Execution

CVE advisorySeverity: CRITICAL (CVSS 9.9)

CVE-2026-109467

Azure DevOps is commonly deployed as an internet-facing service or web application for development teams, frequently accessible via the public internet to facilitate remote collaboration and integration with external CI/CD pipelines.

Authentication Bypass

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory details a critical vulnerability in Azure DevOps. An authorized attacker with network access could potentially execute code, impacting the confidentiality and integrity of affected systems. The primary concern is to confirm if your organization utilizes Azure DevOps and is therefore exposed to this threat.

Improper authentication allows code execution.
Critical flaw in Azure DevOps needs attention.
Assess your Azure DevOps exposure.

Attack Path

How an attacker could exploit the issue

An attacker with existing authorized access could exploit this vulnerability by sending specially crafted requests over the network. This bypasses the intended authentication mechanisms, allowing the attacker to potentially execute arbitrary code within the affected Azure DevOps environment. The exposure of Azure DevOps as an internet-facing service makes it a viable target for such attacks.

Requires authenticated user access.
Network-based request to bypass authentication.
Unauthorized code execution and data compromise.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in Azure DevOps could allow an authenticated attacker to execute arbitrary code over a network, potentially impacting the integrity and availability of the service. The risk is elevated when Azure DevOps is exposed to the internet, as it is commonly used for development workflows and CI/CD pipelines.

Code execution on the service.
Network-based attack by authenticated user.
Compromised service integrity and availability.

Operational Fix

Recommended remediation, mitigation, and detection steps

This critical vulnerability in Azure DevOps could allow an authorized attacker to execute code over a network, impacting environments where Azure DevOps is exposed externally. Action should be coordinated by teams responsible for the Azure DevOps platform and its associated applications. The first practical step is to identify all Azure DevOps deployments, confirm their external reachability and business criticality, and then ascertain the accountable owner to plan remediation based on assessed risk.

Platform and application owners should manage the issue.
Verify external reachability and critical deployments.
Plan remediation with affected teams.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

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Frequently asked questions

What is Azure DevOps and why is it used?

Azure DevOps is a comprehensive platform that supports the entire software development lifecycle. Teams use it to manage code repositories, track project tasks, plan development sprints, and automate CI/CD pipelines to build, test, and deploy applications efficiently.

What does improper authentication mean for CVE-2026-109467?

This vulnerability stems from a weakness categorized as CWE-287. It means the system's authentication mechanisms fail to correctly verify the identity or permissions of a user. In this specific case, the flaw allows an attacker to bypass security checks and execute code on the system.

How is this vulnerability triggered?

An attacker must already have some level of authorized access to the environment to trigger this bug by sending specially crafted network requests. Simply being an unauthenticated guest on the network is insufficient to exploit this flaw.

Do I need to worry if my instance is internal?

While internal instances face lower risk, Halo Surface Signal notes that Azure DevOps is frequently deployed as an internet-facing service to support remote teams. You should assess whether your specific deployment is reachable from the public internet, as external accessibility significantly increases the potential impact.

What should I do first to address this?

Begin by inventorying all your Azure DevOps deployments to understand your total footprint. Once identified, determine which instances are internet-facing and verify who owns each deployment, then collaborate with those owners to plan your response based on the criticality of the services.

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-109467

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.