CVE-2026-47751

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 57% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
43%
KEV
Not listed

Published

June 10, 2026

Last Modified

July 18, 2026

Advisory Details (4)

Auto-updated Jul 16, 2026
Patch available. Sources: github_commit, github_release, github, github_pr.
github_release Patch Available

v1.0.74

Patch available: anthropics/claude-code-action v1.0.74

https://github.com/anthropics/claude-code-action/releases/tag/v1.0.74
github_commit Patch Available

commit 9ddce40de8c1 (anthropics/claude-code-action)

Patch available: anthropics/claude-code-action v1.0.147 (contains commit 9ddce40de8c1)

https://github.com/anthropics/claude-code-action/commit/9ddce40de8c1ab71fb6303a125fdad0968dc1312
github_pr Patch Available

Restore .claude/ and .mcp.json from PR base branch before CLI runs

Patch available: anthropics/claude-code-action v1.0.147 (PR #1066 merged 2026-03-18)

https://github.com/anthropics/claude-code-action/pull/1066
github Patch Available

Malicious MCP Server Configuration in PRs Enables Remote Code Execution and Secret Exfiltration · Advisory · anthropics/claude-code-action · GitHub

https://github.com/anthropics/claude-code-action/security/advisories/GHSA-8q5r-mmjf-575q

Vendor Advisories for CVE-2026-47751(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 18× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-30 01:30 UTCEPSS rescore
  2. 2026-07-29 04:55 UTCEG score recompute
  3. 2026-07-28 15:37 UTCEPSS rescore
  4. 2026-07-28 02:17 UTCEG score recompute
  5. 2026-07-26 20:56 UTCEG score recompute
  6. 2026-07-26 14:54 UTCEPSS rescore
  7. 2026-07-25 14:18 UTCEPSS rescore
  8. 2026-07-24 14:18 UTCEPSS rescore
  9. 2026-07-23 14:18 UTCEPSS rescore
  10. 2026-07-23 03:17 UTCEG score recompute
  11. 2026-07-22 14:08 UTCEPSS rescore
  12. 2026-07-21 15:24 UTCEPSS rescore
  13. 2026-07-20 17:08 UTCEPSS rescore
  14. 2026-07-19 14:31 UTCEPSS rescore
  15. 2026-07-19 02:29 UTCEPSS rescore
  16. 2026-07-18 10:04 UTCEPSS rescore
  17. 2026-07-16 16:31 UTCEG score recompute▲ 5.30
  18. 2026-07-16 16:28 UTCMITRE cvelistV5CVSS v3 → 5.3 · CVSS v4 → 5.3
  19. 2026-06-14 23:18 UTCEPSS rescore
  20. 2026-06-13 23:00 UTCEPSS rescore
  21. 2026-06-12 23:12 UTCEPSS rescore
  22. 2026-06-10 20:17 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-47751?
CVE-2026-47751 is a medium vulnerability published on June 10, 2026. 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…
When was CVE-2026-47751 disclosed?
CVE-2026-47751 was first published in the National Vulnerability Database on June 10, 2026, with the most recent update on July 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47751 actively exploited?
CVE-2026-47751 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.6% of all scored CVEs.
What is the CVSS score of CVE-2026-47751?
CVE-2026-47751 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-47751?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47751, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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