n8n-io n8n up to 2.27.3/2.28.0 Token Identity Resolver behavioral workflow

Summaryinfo

A vulnerability was found in n8n-io n8n up to 2.27.3/2.28.0. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component Token Identity Resolver. Performing a manipulation results in behavioral workflow. This vulnerability was named CVE-2026-59208. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in n8n-io n8n up to 2.27.3/2.28.0. It has been classified as critical. This affects an unknown function of the component Token Identity Resolver. 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 is an open source workflow automation platform. Prior to 2.27.4 and from 2.28.0 prior to 2.28.1, n8n instances configured with more than one trusted token-exchange issuer resolved external identities to local accounts using only the JWT sub claim and ignored the iss claim, allowing an attacker with a valid token from one trusted issuer and a sub matching a victim under another issuer to authenticate as that victim. This issue is fixed in versions 2.27.4 and 2.28.1.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-59208 since 07/02/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2.27.4 or 2.28.1 eliminates this vulnerability.

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Productinfo

Vendor

• n8n-io

Name

• n8n

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23
• 2.24
• 2.25
• 2.26
• 2.27
• 2.27.0
• 2.27.1
• 2.27.2
• 2.27.3
• 2.28.0

Website

• Product: https://github.com/n8n-io/n8n/

CPE 2.3info

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CPE 2.2info

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