CVE-2025-49596inspector Missing Authentication
MCP Inspector proxy server lacks authentication between the Inspector client and proxy
Published Jun 13, 2025 · Updated Oct 21, 2026 · Also known as GHSA-7f8r-222p-6f5g, ROOT-APP-NPM-CVE-2025-49596
Key Facts
Patch immediately- CVE-2025-49596 is a critical-severity vulnerability (CVSS 9.4 v4) affecting @modelcontextprotocol/inspector (npm), inspector, @rootio/modelcontextprotocol__inspector (root).
- It is exploited in the wild, listed in Industry KEV feed since Oct 15, 2025. No public exploit code is known.
- EPSS estimates a 44% probability of exploitation in the next 30 days.
- Fixed versions are available, including @modelcontextprotocol/inspector 0.14.1, @modelcontextprotocol/inspector 0.4.1-aikido.3, @rootio/modelcontextprotocol__inspector 0.4.1-root.io.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v4
9.4
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
EPSS (30-day exploit likelihood)
44%
Higher than 98.7% of all scored CVEs
Exploit maturity
Exploited (KEV)
ATLAS score
58/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Oct 15, 2025
124 days after publication
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Exploited (KEV)
Public exploit code
0
Proof-of-concept links
In-the-wild evidence
1
Reports of active use
Advisories And Exploit References
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Oct 15, 2025 | n/a | Not reported |
Affected Products
4 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| @modelcontextprotocol/inspectornpm | See advisory | 0.14.1 |
| inspector | < 0.14.1 | n/a |
| @rootio/modelcontextprotocol__inspectorroot | See advisory | 0.4.1-root.io.1 |
Patched Releases
@modelcontextprotocol/inspector
0.14.1, 0.4.1-aikido.3
@rootio/modelcontextprotocol__inspector
0.4.1-root.io.1, 0.4.1-root.io.2, 0.4.1-root.io.3
Timeline
Publicly disclosed
Jun 13, 2025
Added to Industry KEV feed
Oct 15, 2025
Last updated
Oct 21, 2026
Weakness Type
- CWE-306 Missing Authentication for Critical Function
References
- advisorycve.org · CVERecord
- advisorynvd.nist.gov · CVE-2025-49596
- advisoryGHSA advisory
- exploitVulnCheck exploitation report
- articlehttps://www.oligo.security/blog/critical-rce-vulnerability-in-anthropic-mcp-inspector-cve-2025-49596
FAQ
Common Questions.
The MCP inspector is a developer tool for testing and debugging MCP servers.
Affected: @modelcontextprotocol/inspector (npm); inspector versions < 0.14.1; @rootio/modelcontextprotocol__inspector (root). The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Oct 15, 2025.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including @modelcontextprotocol/inspector 0.14.1, @modelcontextprotocol/inspector 0.4.1-aikido.3, @rootio/modelcontextprotocol__inspector 0.4.1-root.io.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Is CVE-2025-49596 On Your Attack Surface?
Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.
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