czlonkowski n8n-MCP up to 2.57.3 Multi-Tenant HTTP Mode behavioral workflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.0$0-$5k0.30

Summaryinfo

A vulnerability classified as critical has been found in czlonkowski n8n-MCP up to 2.57.3. Affected by this issue is some unknown functionality of the component Multi-Tenant HTTP Mode. Performing a manipulation results in behavioral workflow. This vulnerability was named CVE-2026-55608. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as critical has been found in czlonkowski n8n-MCP up to 2.57.3. This affects some unknown processing of the component Multi-Tenant HTTP Mode. The manipulation with an unknown input leads to a behavioral workflow vulnerability. CWE is classifying the issue as CWE-841. The product supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-55608 since 06/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Neither technical details nor an exploit are publicly available.

Upgrading to version 2.57.4 eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Behavioral workflow
CWE: CWE-841 / CWE-840
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: n8n-MCP 2.57.4

Timelineinfo

06/17/2026 CVE reserved
07/15/2026 +28 days Advisory disclosed
07/15/2026 +0 days VulDB entry created
07/15/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-55608 (🔒)
GCVE (CVE): GCVE-0-2026-55608
GCVE (VulDB): GCVE-100-379413

Entryinfo

Created: 07/15/2026 23:11
Changes: 07/15/2026 23:11 (54)
Complete: 🔍
Cache ID: 216::103

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