CVE-2026-45582 json
n8n-MCP: Workflow telemetry sanitizer could retain partial values from URL-shaped node parameters
published 2026-05-18 5 mo ago modified 2026-07-21 3 mo ago also EUVD-2026-33319 , GHSA-f3rg-xqjj-cj9w
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 18%
- public exploits
- 0
- none known
Summary
n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.3, the workflow telemetry sanitizer could retain partial fragments of URL-shaped node parameters before sending workflow data to the project's anonymous telemetry backend. Values placed in HTTP-Request-style node parameters — such as customer or tenant identifiers, short secrets embedded in query strings, and signed request parameters — could therefore appear in stored telemetry, contrary to the collection boundary documented in PRIVACY.md. This vulnerability is fixed in 2.51.3.
Patch / fix
- npm n8n-mcp 2.51.3
- n8n-mcp n8n-mcp 2.51.3
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | n8n-mcp | <2.51.3 |
2.51.3 |
Affected products
- czlonkowski n8n-mcp
Classification
- Weakness
-
- CWE-201 Insertion of Sensitive Information Into Sent Data
References
-
github.com
/czlonkowski/n8n-mcp/pull/782
web, issue-tracking, patch
-
github.com
/czlonkowski/n8n-mcp/commit/6cf6fef653fcd6d598f2f356aac4754931c7329f
web, patch
-
github.com
/czlonkowski/n8n-mcp/security/advisories/GHSA-f3rg-xqjj-cj9w
web, mitigation, vendor-advisory
-
github.com
/czlonkowski/n8n-mcp/releases/tag/v2.51.3
web, product, release-notes
-
nvd.nist.gov
/vuln/detail/CVE-2026-45582
advisory
-
github.com
/czlonkowski/n8n-mcp
package
Sources
- CVE List CVE-2026-45582
- GitHub Advisory GHSA-f3rg-xqjj-cj9w
- NVD CVE-2026-45582
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.