Anthropics Claude Code Action vulnerabilities

1 vulnerability

Known vulnerabilities in Anthropics Claude Code Action, newest first, with CVSS severity, EPSS, KEV listings, ransomware use and the affected versions.

5.3MediumCVE-2026-47751anthropics · claude-code-actionClaude Code Action: Malicious MCP Server Configuration in PRs Enables Remote Code Execution and Secret ExfiltrationClaude Code Action is a general-purpose GitHub action that runs Claude Code on GitHub pull requests and issues. Prior to 1.0.74, because the action checked out attacker-controlled pull request head branches, read .mcp.json from the working directory via default setting sources, and unconditionally enabled all project MCP servers via enableAllProjectMcpServers, an attacker who opened a pull request containing a malicious .mcp.json file could achieve arbitrary code execution on the GitHub Actions runner and exfiltrate secrets available to the workflow (such as API keys and tokens) when a privileged user or an automatic trigger invoked the Claude action on the pull request. This issue is fixed in version 1.0.74, which restores .claude/ and .mcp.json from the pull request base branch before the CLI runs.EPSS0.77%