CVE-2026-55608 json
n8n-MCP: Incorrect authorization can expose default-scope workflow version backups in multi-tenant HTTP mode
published 3mo ago modified 18d ago also GHSA-2cf7-hpwf-47h9 , EUVD-2026-44807
- cvss
- 4.2
- 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 20%
- 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 2.57.4, multi-tenant HTTP mode with ENABLE_MULTI_TENANT=true could allow an authenticated tenant to access default-scope workflow_versions backups instead of being confined to the tenant scope, exposing or deleting workflow-version backups from prior single-tenant deployments or migrations. This issue is fixed in version 2.57.4.
Patch / fix
- npm n8n-mcp 2.57.4
- n8n-mcp n8n-mcp 2.57.4
Is CVE-2026-55608 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
- partial
- Assessed
- 3mo ago
Exploit prediction
0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.2 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N |
| NVD | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 4.2 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | n8n-mcp | <2.57.4 |
2.57.4 |
Affected products
- czlonkowski n8n-mcp
Classification
References
-
github.com
/czlonkowski/n8n-mcp/commit/1f42899749ed0c584fb6b4fd63d75233c3edee59
patch
-
github.com
/czlonkowski/n8n-mcp/commit/c1ca1e73697feaec5ec2a5fb7e6992a2892b62c9
web
-
github.com
/czlonkowski/n8n-mcp/security/advisories/GHSA-2cf7-hpwf-47h9
web, mitigation, vendor-advisory
-
github.com
/czlonkowski/n8n-mcp/releases/tag/v2.57.4
web, release-notes
-
github.com
/czlonkowski/n8n-mcp
package
Sources
- CVE List CVE-2026-55608
- GitHub Advisory GHSA-2cf7-hpwf-47h9
- NVD CVE-2026-55608
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.