Privilege Escalation in Azure DevOps: Deep Dive into CVE-2025-47158 Authentication Bypass

When attackers can silently bypass authentication in your CI/CD pipeline, the consequences are immediate: source code theft, supply chain compromise, and privilege escalation across your entire DevOps infrastructure. CVE-2025-47158 is a critical flaw of this kind in Azure DevOps. It allows unauthorized access through a subtle manipulation of data that the platform assumes cannot change.

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Technical Information

Vulnerability Mechanism

CVE-2025-47158 is classified under CWE-302: Authentication Bypass by Assumed-Immutable Data. Azure DevOps trusts identity claims or tokens that it presumes are immutable, and that trust is not justified. An attacker crafts a malicious request containing forged identity tokens or claims. Azure DevOps does not validate these inputs rigorously, so it processes them as legitimate and gives the attacker unauthorized access and the ability to escalate privileges.

Exploitation Flow

A typical attack works like this:

1. The attacker generates a forged token or claim that mimics a privileged user.
2. The attacker sends the forged token to a vulnerable endpoint, such as the Pipeline Job Token Handler.
3. Azure DevOps accepts the manipulated data and grants the attacker elevated access to pipelines, source code, and deployment environments.

Example Attack Payload

POST /vulnerable/authentication/endpoint HTTP/1.1
Host: devops.example.com
Content-Type: application/json

{
  "immutable_data": "Spoofed_identity_claim"
}

Root Cause

Azure DevOps does not validate identity assertions sufficiently. It treats certain authentication data as immutable, but an attacker can forge or tamper with those values over the network and get past the intended security controls.

Affected Components

• Azure DevOps Server (all versions prior to June 2025 security patches)
• Pipeline Job Token Handler
• Visual Studio integrations that rely on the flawed token-handling logic

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Patch Information

The patch for CVE-2025-47158 updates Azure DevOps components to mitigate the authentication bypass. It changes input handling to block exploitation, strengthening validation and restricting unauthorized access paths. Apply the patch immediately via the Microsoft Security Update Guide.

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Affected Systems and Versions

• Azure DevOps Server: All versions prior to the June 2025 security patches
• Visual Studio integrations: Any integration using pre-June 2025 Azure DevOps token logic
• Pipeline Job Token Handler: Vulnerable in unpatched deployments

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Vendor Security History

Microsoft Azure DevOps has had several high-impact authentication and token-handling vulnerabilities in recent years, including CVE-2025-29813. Microsoft typically releases patches within a month of disclosure, but similar flaws keep appearing, which points to ongoing architectural problems in its authentication workflows.

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References

• Microsoft Security Update Guide: CVE-2025-47158
• NVD: CVE-2025-47158
• CVE.org: CVE-2025-47158
• VulDB: CVE-2025-47158
• The Hacker News: Microsoft Fixes 78 Flaws, 5 Zero-Days
• Tenable: CVE-2025-29813
• Ameeba: CVE-2025-29813 Authentication Bypass

Source: This report was created using AI

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