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Claude Code Action: Malicious MCP Server Configuration in PRs Enables Remote Code Execution and Secret Exfiltration
Claude Code Action: Malicious MCP Server Configuration in PRs Enables Remote Code Execution and Secret Exfiltration
Affected packages
- anthropics/claude-code-action— before 1.0.74
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- https://github.com/anthropics/claude-code-action/security/advisories/GHSA-8q5r-mmjf-575q
- https://nvd.nist.gov/vuln/detail/CVE-2026-47751
- https://github.com/anthropics/claude-code-action/pull/1066
- https://github.com/anthropics/claude-code-action/commit/9ddce40de8c1ab71fb6303a125fdad0968dc1312
- https://github.com/anthropics/claude-code-action
- https://github.com/anthropics/claude-code-action/releases/tag/v1.0.74
Structured record: https://osv.dev/vulnerability/GHSA-8q5r-mmjf-575q
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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