MCP Inspector proxy server lacks authentication between the Inspector client and proxy
Published Jun 13, 2025
9.4
CRITICALCVSS 4.0
EPSS 44.45%
Description
The MCP inspector is a developer tool for testing and debugging MCP servers. Versions of MCP Inspector below 0.14.1 are vulnerable to remote code execution due to lack of authentication between the Inspector client and proxy, allowing unauthenticated requests to launch MCP commands over stdio. Users should immediately upgrade to version 0.14.1 or later to address these vulnerabilities.
Affected products
-
- Version < 0.14.1StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Modelcontextprotocol | Inspector | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
@modelcontextprotocol/inspector
npm
Introduced 0 Fixed 0.14.1
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | @modelcontextprotocol/inspector | 0 | 0.14.1 |
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
TotalDecision
n/aAssessed Jun 13, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2025–2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (24 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 44.45% (0.44453) | 98.73th | v5 (v2026.06.15) |
| Sep 14, 2026 | 44.45% (0.44453) | 98.69th | v5 (v2026.06.15) |
| Sep 3, 2026 | 42.67% (0.42669) | 98.62th | v5 (v2026.06.15) |
| Jul 24, 2026 | 45.00% (0.44998) | 98.65th | v5 (v2026.06.15) |
| Jul 3, 2026 | 38.53% (0.38532) | 98.39th | v5 (v2026.06.15) |
| Jun 15, 2026 | 37.03% (0.37030) | 98.32th | v5 (v2026.06.15) |
| Mar 4, 2026 | 2.54% (0.02542) | 85.20th | v4 (v2025.03.14) |
| Mar 1, 2026 | 1.13% (0.01125) | 78.10th | v4 (v2025.03.14) |
| Feb 4, 2026 | 4.12% (0.04124) | 88.35th | v4 (v2025.03.14) |
| Feb 1, 2026 | 1.13% (0.01125) | 77.97th | v4 (v2025.03.14) |
| Jan 4, 2026 | 4.16% (0.04159) | 88.32th | v4 (v2025.03.14) |
| Jan 1, 2026 | 1.14% (0.01135) | 78.02th | v4 (v2025.03.14) |
| Dec 4, 2025 | 3.80% (0.03802) | 87.67th | v4 (v2025.03.14) |
| Dec 1, 2025 | 1.14% (0.01135) | 77.86th | v4 (v2025.03.14) |
| Nov 21, 2025 | 4.22% (0.04224) | 88.27th | v4 (v2025.03.14) |
| Nov 18, 2025 | 8.94% (0.08944) | 91.74th | v4 (v2025.03.14) |
| Nov 10, 2025 | 2.82% (0.02821) | 85.65th | v4 (v2025.03.14) |
| Nov 4, 2025 | 3.92% (0.03920) | 87.79th | v4 (v2025.03.14) |
| Nov 1, 2025 | 2.03% (0.02027) | 83.24th | v4 (v2025.03.14) |
| Oct 4, 2025 | 3.15% (0.03153) | 86.39th | v4 (v2025.03.14) |
| Oct 1, 2025 | 1.88% (0.01885) | 82.57th | v4 (v2025.03.14) |
| Sep 24, 2025 | 3.15% (0.03153) | 86.40th | v4 (v2025.03.14) |
| Sep 16, 2025 | 4.80% (0.04801) | 89.07th | v4 (v2025.03.14) |
| Jun 14, 2025 | 0.33% (0.00328) | 55.17th | v4 (v2025.03.14) |
References (6)
- https://github.com/advisories/GHSA-7f8r-222p-6f5g Advisory
- https://github.com/modelcontextprotocol/inspector/commit/50df0e1ec488f3983740b4d28d2a968f12eb8979 x_refsource_MISC
- https://github.com/modelcontextprotocol/inspector/security/advisories/GHSA-7f8r-222p-6f5g x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2025-49596
- https://thenewstack.io/mcp-vulnerability-exposes-the-ai-untrusted-code-crisis x_refsource_MISC
- https://www.oligo.security/blog/critical-rce-vulnerability-in-anthropic-mcp-inspector-cve-2025-49596 x_refsource_MISC
Change history (0)
No recorded changes yet.