Claude Code echo command allowed bypass of user approval prompt for command execution
Priority MEDIUM 42CWE-78Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-78.
Summary
Claude Code is an agentic coding tool. In versions below 1.0.20, an error in command parsing makes it possible to bypass the Claude Code confirmation prompt to trigger execution of an untrusted command. Reliably exploiting this requires the ability to add untrusted content into a Claude Code context window. This is fixed in version 1.0.20.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01092 65th percentileScored 2026-11-07
Fix Fixed claude-code (anthropics): 1.0.20@anthropic-ai/claude-code (npm): 1.0.20
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| anthropics | claude-code | before 1.0.20 | 1.0.20 | Patch available | CNA |
| — | @anthropic-ai/claude-code (npm) | before 1.0.20 | 1.0.20 | Patch available | GHSA-x56v-x2h6-7j34 |
- claude-code Vendoranthropics Affected before 1.0.20 Fixed in 1.0.20 Patch available CNA
- @anthropic-ai/claude-code (npm) Vendor— Affected before 1.0.20 Fixed in 1.0.20 Patch available GHSA-x56v-x2h6-7j34
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:* | before 1.0.20 | Vulnerable | anthropics |
- cpe:2.3:a:anthropic:claude_code:*:*:*:*:*:node.js:*:* Versions before 1.0.20 Vulnerable ·anthropics
Remediation
- Fix · CNA claude-code (anthropics) Fixed in 1.0.20
- Fix · GHSA-x56v-x2h6-7j34 @anthropic-ai/claude-code (npm) Fixed in 1.0.20 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-54795
- 2026-10-03 Alias added: GHSA-x56v-x2h6-7j34
References
More anthropics Claude Code vulnerabilities
- TI-2025-40558 Claude Code Command Validation Bypass Allows Arbitrary Code Execution CVSS 4.0HIGH 8.7
- TI-2025-36683 Claude Code vulnerable to arbitrary code execution caused by maliciously configured git email CVSS 4.0HIGH 8.7
- TI-2025-37066 Claude Code's startup trust dialog could lead to Command Execution attack CVSS 4.0HIGH 8.7
- TI-2026-17554 Claude Code Leaks Data via Malicious Environment Configuration Before Trust Confirmation CVSS 4.0MEDIUM 5.3
- TI-2025-40093 @anthropic-ai/claude-code has Sed Command Validation Bypass that Allows Arbitrary File Writes CVSS 4.0HIGH 8.7
- TI-2025-36422 Claude Code rg command had Command Injection that allowed bypass of user approval prompt for command execution CVSS 4.0HIGH 8.7
Sources
- CVE-2025-54795 · CVE Program
- CVE-2025-54795 · NVD
- FIRST EPSS
- GHSA-x56v-x2h6-7j34 · GitHub Advisory Database · CC BY 4.0
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