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CVE-2026-47751

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
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:628b9aa4c73dbbf6d96d93a77e5fd9b9d07212c3aa7aaa9f738092e0bbb27844
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-200","description":"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1cdc24269efa712764d27126f47df7bff89e600dc20edf6e6d245964c440b5fb · sha256:41158045c1ff2875… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-78","description":"CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1cdc24269efa712764d27126f47df7bff89e600dc20edf6e6d245964c440b5fb · sha256:41158045c1ff2875… · /containers/cna/problemTypes/0/descriptions/0

Affected products and versions

1 source assertion
{"product":"claude-code-action","vendor":"anthropics","versions":[{"status":"affected","version":"< 1.0.74"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:1cdc24269efa712764d27126f47df7bff89e600dc20edf6e6d245964c440b5fb · sha256:41158045c1ff2875… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":5.3,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:1cdc24269efa712764d27126f47df7bff89e600dc20edf6e6d245964c440b5fb · sha256:41158045c1ff2875… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

2 source assertions
{"cweId":"CWE-200","description":"CWE-200: Exposure of Sensitive Information to an Unauthorized Actor","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1cdc24269efa712764d27126f47df7bff89e600dc20edf6e6d245964c440b5fb · sha256:41158045c1ff2875… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-78","description":"CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:1cdc24269efa712764d27126f47df7bff89e600dc20edf6e6d245964c440b5fb · sha256:41158045c1ff2875… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/anthropics/claude-code-action/commit/9ddce40de8c1ab71fb6303a125fdad0968dc1312","tags":["x_refsource_MISC"],"url":"https://github.com/anthropics/claude-code-action/commit/9ddce40de8c1ab71fb6303a125fdad0968dc1312"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1cdc24269efa712764d27126f47df7bff89e600dc20edf6e6d245964c440b5fb · sha256:41158045c1ff2875… · /containers/cna/references/2
{"name":"https://github.com/anthropics/claude-code-action/pull/1066","tags":["x_refsource_MISC"],"url":"https://github.com/anthropics/claude-code-action/pull/1066"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1cdc24269efa712764d27126f47df7bff89e600dc20edf6e6d245964c440b5fb · sha256:41158045c1ff2875… · /containers/cna/references/1
{"name":"https://github.com/anthropics/claude-code-action/releases/tag/v1.0.74","tags":["x_refsource_MISC"],"url":"https://github.com/anthropics/claude-code-action/releases/tag/v1.0.74"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1cdc24269efa712764d27126f47df7bff89e600dc20edf6e6d245964c440b5fb · sha256:41158045c1ff2875… · /containers/cna/references/3
{"name":"https://github.com/anthropics/claude-code-action/security/advisories/GHSA-8q5r-mmjf-575q","tags":["x_refsource_CONFIRM"],"url":"https://github.com/anthropics/claude-code-action/security/advisories/GHSA-8q5r-mmjf-575q"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:1cdc24269efa712764d27126f47df7bff89e600dc20edf6e6d245964c440b5fb · sha256:41158045c1ff2875… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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