gcdRadar
archive/Patch now/AIR-2026-1187
closedclosed 16 Jul 2026Patch now2 Disclosed vulnerabilityAI

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

Claude Code Action

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

CVSS
5.3
EPSS
0.01 · top 44% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
16 Jul 2026
last update
16 Jul 2026
CVE ids
CVE-2026-47751other records

Timeline · 1

  1. 16 Jul 2026CVE-2026-47751: Claude Code Action is a general-purpose GitHub action that runs Claude Code on GitHub pull requests and issues.

Sources · 1

Advisories and databases

  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

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerabilitySupply chain
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Anthropic, Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
AML.T0010 AI Supply Chain Compromise
tags
mcprce
dates
happened 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.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-47751: Claude Code Action vulnerable to malicious MCP configuration

https://gcdradar.vercel.app/incidents/cve-2026-47751-claude-code-action-vulnerable-to-malicious-mc · AIR-2026-1187 · closed 2026-07-16

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-07-16
- AI role: Attack on AI
- Products: Claude Code Action
- CVE ids: CVE-2026-47751
- CVSS: 5.3

## Summary

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.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 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. (https://nvd.nist.gov/vuln/detail/CVE-2026-47751)

## Sources

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

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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