Server-side Request Forgery (SSRF) Affecting @frontmcp/sdk package, versions <1.0.4
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-JS-FRONTMCPSDK-16423474
- published5 May 2026
- disclosed8 Apr 2026
- creditTharVid
Introduced: 8 Apr 2026
NewCVE-2026-39885 (opens in a new tab)How to fix?
Upgrade @frontmcp/sdk to version 1.0.4 or higher.
Overview
@frontmcp/sdk is a FrontMCP SDK
Affected versions of this package are vulnerable to Server-side Request Forgery (SSRF) in the initialize process. An attacker can access internal network resources or sensitive local files by submitting a crafted OpenAPI specification containing malicious $ref values.