CVE-2026-45707VulnerabilityPublished 13 Aug 2026Updated 26 Oct 2026

n8n-MCP: Multi-tenant MCP requests fall back to process-level n8n credentials when tenant headers are absent or

Affects n8n-mcpSource GCVE Database

Authoritative record:CVE-2026-45707· High 8.1

Not known to be exploited · CVSS 8.1 High : upgrade to 2.51.3 soon.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

8.1High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 2.51.3

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: Low
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 29 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade n8n-mcp to 2.51.3.

Affected software

Product	Affected	Fixed in
Homebrewn8n-mcp`pkg:brew/n8n-mcp`Other threats	Affected >=2.14.1 <2.51.3	Fixed in 2.51.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available in n8n-mcp version 2.51.3. Operators should upgrade to this version to reject malformed multi-tenant requests and prevent fallback to operator credentials. If immediate upgrade is not possible, mitigations include disabling multi-tenant mode (ENABLE_MULTI_TENANT=false), enforcing proxy-level checks to require both x-n8n-url and x-n8n-key headers on every request, and reducing the scope of the operator's API key to limit potential damage from fallback exploitation.

Description

A vulnerability in n8n-mcp's multi-tenant HTTP mode allows authenticated tenants to cause requests missing required tenant headers to fall back to the operator's own n8n instance credentials. This can lead to unauthorized access to the operator's workflows, executions, data, and credentials, and potentially remote code execution if code-node execution is permitted. The issue affects multi-tenant deployments with ENABLE_MULTI_TENANT=true and is fixed in n8n-mcp 2.51.3.

Impact

An authenticated tenant exploiting this vulnerability can access and modify the operator's n8n instance data and workflows, potentially leading to unauthorized data exposure and manipulation. If code-node execution with OS-level access is enabled, the attacker could achieve remote code execution on the operator's system. The operator's API key used in the fallback is typically high-privilege, increasing the severity of the impact.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 17:14 UTC

Technical details

References

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