CVE-2026-54052 json
n8n-MCP: Cross-tenant access to workflow version backups in multi-tenant HTTP deployments
published 3mo ago modified 18d ago also GHSA-j6r7-6fhx-77wx , EUVD-2026-44806
- cvss
- 9.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 33%
- 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 2.56.1, in HTTP mode with multi-tenancy enabled through ENABLE_MULTI_TENANT=true, n8n-mcp's local workflow version history backups were not isolated per tenant, allowing an authenticated tenant to read workflow version snapshots belonging to other tenants and delete or destroy other tenants' stored backups, including full node definitions, credential references, and authorization headers. This issue is fixed in version 2.56.1.
Patch / fix
- npm n8n-mcp 2.56.1
- n8n-mcp n8n-mcp 2.56.1
Is CVE-2026-54052 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 3mo ago
Exploit prediction
0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L |
| NVD | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L |
| GitHub | 3.1 | 9.9 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | n8n-mcp | <2.56.1 |
2.56.1 |
Affected products
- czlonkowski n8n-mcp
Classification
References
-
github.com
/czlonkowski/n8n-mcp/security/advisories/GHSA-j6r7-6fhx-77wx
web, mitigation, vendor-advisory
-
github.com
/czlonkowski/n8n-mcp/releases/tag/v2.56.1
web, release-notes
-
github.com
/czlonkowski/n8n-mcp
package
Sources
- CVE List CVE-2026-54052
- GitHub Advisory GHSA-j6r7-6fhx-77wx
- NVD CVE-2026-54052
Fencer Intel 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.