GCD AI RADAR
incidents/AIR-2026-1187

CVE-2026-47751: Claude Code Action vulnerable to malicious MCP configuration

Attack on AI2 Disclosed vulnerabilityInfrastructure vulnerabilitySupply chain

An insecure configuration in Claude Code Action allows attackers opening pull requests with malicious .mcp.json files to execute code on runners. The vulnerability is fixed in version 1.0.74.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

Details

type
Attack on AI
An AI model, agent or AI-powered product was the thing exploited, abused or leaked.
categories
  • Infrastructure vulnerabilityprimary
    CVEs and advisories in AI frameworks, inference servers, MCP servers, AI developer tools and hosting stacks.
  • Supply chain
    Malicious or backdoored models, poisoned packages, unsafe deserialization and other compromised AI dependencies.
owasp llm top 10
mitre atlas
Both rows are derived from the type and categories (OWASP 2025 edition, ATLAS release 2026.09), not classified per record. How
severity
2 · Disclosed vulnerability
CVE or vendor advisory, patched or patchable, no confirmed exploitation.
targets
Anthropic, Framework / tooling
products
Claude Code Action
incident date
16 Jul 2026
first reported
16 Jul 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
classifier confidence
0.95 · published at or above 0.80; see the methodology
tags
CVE-2026-47751 · mcp · rce
record
created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z · json

Sources · 1

  1. 2026-07-16
    CVE-2026-47751: Claude Code Action is a general-purpose GitHub action that runs Claude Code on GitHub pull requests and issues.
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-47751

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