synced 2 MIN AGO
01 Record

CVE-2026-59973

mcp-from-openapi: Bypass of OpenAPI external $ref SSRF fix in latest FrontMCP and mcp-from-openapi

HighPUBLISHEDCNA: GitHub_M
CNA base score8.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
View raw JSON

02 Description

mcp-from-openapi: Bypass of OpenAPI external $ref SSRF fix in latest FrontMCP and mcp-from-openapi

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.39% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 33.1% of scored records. A rank, not a probability.
NVD base score
8.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
NVD analysis status
Received. NVD last modified this record on 2026-09-16.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-09-15 15:13Z1 MO AGO
Last updated
2026-09-16 16:06Z1 MO AGO
Reserved
2026-07-07
Assigning CNA
GitHub_M
Record state
PUBLISHED
Severity
High (CVSS 8.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
Weaknesses
  • CWE-918Server-Side Request Forgery (SSRF)Base
Data version
5.2
Document digest
6bf10b4a8a12ccf9e154ada6190ce36920ad2d4670f7b8abb0ad9873dfc32135

05 Affected products

VendorProductVersionsPlatforms
agentfrontfrontmcp< 1.5.0—
agentfrontmcp-from-openapi< 2.5.0—
@frontmcpadapters< 1.5.0—

06 References