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CVE-2025-29813: Authentication Bypass Vulnerability in Azure DevOps

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Overview

The vulnerability titled CVE-2025-29813 pertains to Azure DevOps, a suite of development tools, services, and features provided by Microsoft. This vulnerability is significant due to the potential for an unauthorized attacker to bypass authentication by exploiting assumed-immutable data, thus leading to a possible escalation of privileges over a network. Given the widespread use of Azure DevOps, the impact of this vulnerability is far-reaching, potentially affecting numerous organizations and systems worldwide.
The seriousness of this vulnerability is underscored by its CVSS Severity Score of 10.0, denoting the highest level of severity. The implications of a successful exploit could result in system compromise or data leakage, posing a significant risk to system integrity and data confidentiality.

Vulnerability Summary

CVE ID: CVE-2025-29813
Severity: Critical (10.0)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise or data leakage

Affected Products

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Product | Affected Versions

Azure DevOps | All versions prior to patch

How the Exploit Works

The exploit works by leveraging a flaw in the authentication process of Azure DevOps. The flaw lies in the handling of data assumed to be immutable during the authentication process. An unauthorized attacker can manipulate this data to spoof identity claims, thus bypassing the authentication mechanism. This can lead to an elevation of privileges over a network, providing unauthorized access to resources and potentially compromising the system or leading to data leakage.

Conceptual Example Code

Here is a conceptual example of how the vulnerability might be exploited. This example showcases a malicious HTTP request, which could be used to manipulate the assumed-immutable data:

POST /vulnerable/authentication/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "immutable_data": "Spoofed_identity_claim" }

In this example, “immutable_data” is the assumed-immutable data that the authentication mechanism relies on, and “Spoofed_identity_claim” is the manipulated data that the attacker uses to bypass authentication.

Mitigations

Users are advised to apply the vendor patch as soon as possible to mitigate this vulnerability. Until the patch can be applied, users should consider implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. These systems can help detect and prevent unauthorized access attempts, thus minimizing the potential impact of the vulnerability.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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