Security Digest · Vulnerability record
CVE-2025-6514: mcp-remote exposed to OS command injection via untrusted MCP server connections
mcp-remote is exposed to OS command injection when connecting to untrusted MCP servers due to crafted input from the authorizationendpoint response URL
CVSS 9.6 Critical EPSS 77.0% · p99.6 Check exposure
Should you act?
High exploit likelihood
EPSS ranks it in the top 5% of all CVEs for likely exploitation in the next 30 days. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.
- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 77.0%, percentile 99.6: FIRST’s model estimates a 77.0% chance of exploitation activity in the next 30 days, higher than 99.6% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
- Only applies if your dependency tree includes
mcp-remote(npm) >= 0.0.5, < 0.1.16, fixed in 0.1.16. Check your lockfile, including transitive dependencies. - Editorial verdict: Check exposure. mcp-remote: OS Command Injection via OAuth Endpoint — The fix is more than a year old, but version-pinned MCP client configs and stale npx caches can keep a vulnerable mcp-remote alive, so confirm the version and move on.
What it is
mcp-remote is exposed to OS command injection when connecting to untrusted MCP servers due to crafted input from the authorizationendpoint response URL
From the GitHub advisory
mcp-remote is exposed to OS command injection when connecting to untrusted MCP servers due to crafted input from the authorizationendpoint response URL
Weakness type: CWE-78.
Product: mcp-remote (npm) · Assigned by: JFROG · Published: 2025-07-09
Affected and fixed versions
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| npm | mcp-remote | >= 0.0.5, < 0.1.16 | 0.1.16 |
| Vendor | Product | Affected versions (per CVE record) |
|---|---|---|
| mcp-remote | 0.0.5 <= 0.1.15 |
Severity scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| JFROG | 3.1 | 9.6 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
| GitHub | 3.1 | 9.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H |
- Attack vector: network (remotely reachable)
- Attack complexity: low
- Privileges required: none (no login)
- User interaction: required (a user must click/open something)
- Scope: changed (can affect other components)
CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.
Exploitation and urgency
- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
- FIRST EPSS (model of 2026-10-21): 77.03% probability of exploitation activity in the next 30 days; percentile 99.6.
Timeline
- — CVE record last updated
- — CVE record published by JFROG
- — GitHub-reviewed advisory GHSA-6xpm-ggf7-wc3p published (critical)
- — erroneo.us brief: mcp-remote: OS Command Injection via OAuth Endpoint
Sources and references
Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.
Vendor and project advisories, patches
- github.com github.com
Vulnerability records
- GitHub Advisory GHSA-6xpm-ggf7-wc3p github.com
- CVE.org record CVE-2025-6514 cve.org
- NVD entry CVE-2025-6514 nvd.nist.gov
Other references from the CVE record and advisory
- research.jfrog.com research.jfrog.com
- jfrog.com jfrog.com