OpenAPI Specification Load Vulnerability in FrontMCP by AgentFront
CVE-2026-59973

8.5HIGH

Key Information:

Vendor

Agentfront

Status
Frontmcp
Mcp-from-openapi
Adapters
Vendor
CVE Published:
15 September 2026

What is CVE-2026-59973?

The FrontMCP framework, when used with certain versions of mcp-from-openapi and its associated adapters, contains a vulnerability in how it handles untrusted OpenAPI URL inputs. This can allow authenticated users to inadvertently direct requests to internal services through unsafe DNS resolutions and redirects. If exploited, this can expose sensitive administrative APIs and other private services, potentially compromising the security of the affected environment. It is crucial to upgrade to the fixed versions to eliminate this risk.

Affected Version(s)

adapters < 1.5.0

frontmcp < 1.5.0

mcp-from-openapi < 2.5.0

References

https://github.com/agentfront/frontmcp/security/advisorie...
x_refsource_CONFIRM
https://github.com/agentfront/frontmcp/pull/496
x_refsource_MISC
https://github.com/agentfront/mcp-from-openapi/pull/7
x_refsource_MISC

CVSS V3.1

Score:
8.5
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.