n8n-io n8n up to 2.37.6/2.38.1 Chat Execution Manager chat-execution-manager.ts canResumeOverChat resumeToken improper authorization

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.88+

Summaryinfo

A vulnerability categorized as critical has been discovered in n8n-io n8n up to 2.37.6/2.38.1. This affects the function canResumeOverChat of the file packages/cli/src/chat/chat-execution-manager.ts of the component Chat Execution Manager. Such manipulation of the argument resumeToken leads to improper authorization. This vulnerability is listed as CVE-2026-86077. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in n8n-io n8n up to 2.37.6/2.38.1. It has been rated as critical. Affected by this issue is the function canResumeOverChat of the file packages/cli/src/chat/chat-execution-manager.ts of the component Chat Execution Manager. The manipulation of the argument resumeToken with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. CVE summarizes:

n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the /chat WebSocket route accepted a resumeToken and resumed a paused execution without checking that the target node supported chat messages. An anonymous form submitter who received that token could reuse it on the chat route to release a Send-and-Wait, non-chat HITL, or Wait approval gate. The affected authorization logic is packages/cli/src/chat/chat-execution-manager.ts, where canResumeOverChat did not gate the resume target. This issue is fixed in versions 2.37.7 and 2.38.2.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-86077 since 09/04/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 2.37.7 or 2.38.2 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
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: Improper authorization
CWE: CWE-285 / CWE-266
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: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: n8n 2.37.7/2.38.2

Timelineinfo

09/04/2026 CVE reserved
09/08/2026 +4 days Advisory disclosed
09/08/2026 +0 days VulDB entry created
09/08/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-86077 (🔒)
GCVE (CVE): GCVE-0-2026-86077
GCVE (VulDB): GCVE-100-400688

Entryinfo

Created: 09/08/2026 23:47
Changes: 09/08/2026 23:47 (70)
Complete: 🔍
Cache ID: 216::103

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