01 Record
CVE-2026-39974
n8n-MCP has an Authenticated SSRF via instance-URL header in multi-tenant HTTP mode
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
02 Description
n8n-MCP has an Authenticated SSRF via instance-URL header in multi-tenant HTTP mode
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 0.31% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 24.3% 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
- Analyzed. NVD last modified this record on 2026-10-26.
- 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
- 2026-04-09 16:45Z6 MO AGO
- Last updated
- 2026-04-13 20:09Z6 MO AGO
- Reserved
- 2026-04-08
- 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
- 84bec43665795c7cd6511191c8c43d6dd9e69a72c3f83b823b429de4a82233e7
05 Affected products
VendorProductVersionsPlatforms