CVE-2026-47751

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Source
https://cve.org/CVERecord?id=CVE-2026-47751
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-47751.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-47751
Aliases
Published
2026-07-16T15:59:29.885Z
Modified
2026-07-19T03:31:31.284297917Z
Severity
  • 5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N CVSS Calculator
Summary
Claude Code Action: Malicious MCP Server Configuration in PRs Enables Remote Code Execution and Secret Exfiltration
Details

Claude 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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47751.json",
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-200",
        "CWE-78"
    ]
}
References

Affected packages

Git / github.com/anthropics/claude-code-action

Affected ranges

Type
GIT
Repo
https://github.com/anthropics/claude-code-action
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
9ddce40de8c1ab71fb6303a125fdad0968dc1312
Fixed
1ba15be4f0b0c9a026c0c7986668f8f2aa998440
Database specific 
{
    "source": [
        "AFFECTED_FIELD",
        "REFERENCES"
    ],
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.0.74"
        }
    ]
}

Affected versions

Other
beta
v0
v0.*
v0.0.1
v0.0.10
v0.0.11
v0.0.12
v0.0.13
v0.0.14
v0.0.15
v0.0.16
v0.0.17
v0.0.18
v0.0.19
v0.0.2
v0.0.20
v0.0.21
v0.0.22
v0.0.23
v0.0.24
v0.0.25
v0.0.26
v0.0.27
v0.0.28
v0.0.29
v0.0.3
v0.0.30
v0.0.31
v0.0.32
v0.0.33
v0.0.34
v0.0.35
v0.0.36
v0.0.37
v0.0.38
v0.0.39
v0.0.4
v0.0.40
v0.0.41
v0.0.42
v0.0.43
v0.0.44
v0.0.45
v0.0.46
v0.0.47
v0.0.48
v0.0.49
v0.0.5
v0.0.50
v0.0.51
v0.0.52
v0.0.53
v0.0.54
v0.0.55
v0.0.56
v0.0.57
v0.0.58
v0.0.59
v0.0.6
v0.0.60
v0.0.61
v0.0.62
v0.0.63
v0.0.7
v0.0.8
v0.0.9
v1.*
v1.0.0
v1.0.1
v1.0.10
v1.0.11
v1.0.12
v1.0.13
v1.0.14
v1.0.15
v1.0.16
v1.0.17
v1.0.18
v1.0.19
v1.0.2
v1.0.20
v1.0.21
v1.0.22
v1.0.23
v1.0.24
v1.0.25
v1.0.26
v1.0.27
v1.0.28
v1.0.29
v1.0.3
v1.0.30
v1.0.31
v1.0.32
v1.0.33
v1.0.34
v1.0.35
v1.0.36
v1.0.37
v1.0.38
v1.0.39
v1.0.4
v1.0.40
v1.0.41
v1.0.42
v1.0.43
v1.0.44
v1.0.45
v1.0.46
v1.0.47
v1.0.48
v1.0.49
v1.0.5
v1.0.50
v1.0.51
v1.0.52
v1.0.53
v1.0.54
v1.0.55
v1.0.56
v1.0.57
v1.0.58
v1.0.59
v1.0.6
v1.0.60
v1.0.61
v1.0.62
v1.0.63
v1.0.64
v1.0.65
v1.0.66
v1.0.67
v1.0.68
v1.0.69
v1.0.7
v1.0.70
v1.0.71
v1.0.72
v1.0.73
v1.0.8
v1.0.9

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-47751.json"