PT-2026-48540

CVE-2026-47751

Published

2026-06-10

Updated

2026-10-24

Description by

CVSS 4.0

5.3

Medium

MetricsAV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions Claude Code Action versions prior to 1.0.74

Description An issue exists where the action checks out attacker-controlled pull request head branches and reads the .mcp.json file from the working directory. Because all project MCP (Model Context Protocol) servers are unconditionally enabled via enableAllProjectMcpServers, an attacker can include a malicious .mcp.json file in a pull request to achieve arbitrary code execution on the GitHub Actions runner. This can lead to the exfiltration of workflow secrets, such as API keys and tokens, when a privileged user or an automatic trigger invokes the action on the pull request.

Recommendations Update to version 1.0.74 or later.

Exploitability

Exploit

Fix

Impacts

Vendors

Affected products

Weakness enumeration

CWE-200: Exposure of Sensitive Information to an Unauthorized Actor

CWE-78: Improper Neutralization of Special Elements used in an OS Command (\'OS Command Injection\')

Related identifiers

CVE-2026-47751