Bottom line: A missing prompt injection protection measure in the Azure DevOps MCP server allows hidden comments to redirect control flow of AI agents and trigger data leaks.
A security vulnerability in the official Azure DevOps MCP server enables attackers to hijack AI coding agents of reviewers via concealed pull request comments and gain access to unauthorized projects.
The security issue resides in Microsoft’s official Azure DevOps MCP server (Model Context Protocol). The flaw arises because one of the provided tools reads pull request descriptions without appropriate prompt injection protection measures — a security consideration that was known to the company but was missing from this implementation.
An attacker can insert a hidden (or difficult to detect) comment into a pull request. When a reviewer agent processes this PR, the instruction in the hidden comment is interpreted as part of the legitimate pull request context. The agent follows the malicious instruction even though it does not originate from the reviewer.
Specifically, the MCP tool can be tricked into accessing repositories or projects for which the attacker has no permissions. The compromised agent executes the commands with the reviewer’s credentials and can exfiltrate sensitive information — a classic privilege escalation attack via AI agents.
For CISOs, this means: AI-powered code review workflows in Azure DevOps require immediate verification for prompt injection resistance. Even “official” Microsoft integrations can exhibit unsafe agent context handling. This is particularly critical in multi-project environments with granular access control lists (ACLs), where a compromised agent can move laterally at scale.
Source: thehackernews.com · Published 22 July 2026
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