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ADVISORY · 2026-06-11 · SRC MSFT-SECURITY · MEDIUM
2026-06-11 medium REL 6/10

Prompt Injection Vulnerability Found in Claude Code GitHub Action CI/CD Workflows

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Microsoft Threat Intelligence discovered a prompt injection vulnerability in the Claude Code GitHub Action that could expose workflow secrets under certain conditions. The research details the attack mechanism, Anthropic’s response, and best practices for securing AI-assisted CI/CD pipelines. This demonstrates emerging security risks as AI agents are integrated into development automation.

Why it matters in Western Canada: Organizations across Western Canada using GitHub Actions for CI/CD automation—particularly in tech, energy, and financial sectors—should review their AI-powered workflow configurations to prevent unauthorized access to sensitive credentials and deployment secrets.


Summary generated from the original advisory. Read the full source: msft-security

Source
https://www.microsoft.com/en-us/security/blog/2026/06/05/securing-ci-cd-in-agentic-world-claude-code-github-action-case/
CVEs
None listed
Tags
prompt-injection, ci-cd, github-actions, ai-security, secrets-management
Provenance
mask2-ti-pipeline (AI-assisted, human-reviewable)