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CVE-2026-118679— n8n before 1.123.83, 2.41.4, and 2.42.1 Slack Token Exfiltration via Slack Trigger

Quick assessment

Affected

n8n-io n8n

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

n8n 在 1.123.83、2.41.4 和 2.42.1 之前的版本中，其 Slack 触发器（Slack Trigger）的 Webhook 功能存在服务器端请求伪造（SSRF）漏洞。当未配置签名密钥（signing secret）时，该漏洞允许未认证的攻击者绕过签名验证，从而窃取 Slack 令牌。若攻击者知晓 Webhook 的 URL，可指定要下载的文件名称，促使该节点将工作区访问令牌发送至攻击者控制的服务器，并返回响应。

CVSS 7.5 · High Updated Oct 29, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

Vendor	Product	Version Range	Status
n8n-io	n8n	`< 1.123.83`	affected
		`1.123.83`	unaffected
		`2.42.0< 2.42.1`	affected
		`2.42.1`	unaffected
		`2.0.0< 2.41.4`	affected
		`2.41.4`	unaffected

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Vulnerability Information

Have questions about the vulnerability? See if Shenlong's analysis helps!

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Vulnerability Title

n8n before 1.123.83, 2.41.4, and 2.42.1 Slack Token Exfiltration via Slack Trigger

Source: CVE Program / CVE List V5

Vulnerability Description

n8n before 1.123.83, 2.41.4, and 2.42.1 contains a server-side request forgery vulnerability in the Slack Trigger webhook that allows unauthenticated attackers to exfiltrate Slack tokens by bypassing signature verification when no signing secret is set. Attackers who know the webhook URL can name a file to download, causing the node to send the workspace access token to an attacker host and return the response.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

服务端请求伪造(SSRF)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE
n8n-io	n8n	0 ~ 1.123.83	-
n8n-io	n8n	2.42.0 ~ 2.42.1	-
n8n-io	n8n	2.0.0 ~ 2.41.4	-

II. Public POCs for CVE-2026-118679

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-118679

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Vendor Advisories for CVE-2026-118679 (2)

https://www.cve.org/CVERecord?id=CVE-2026-118679

Same Patch Batch · n8n-io · 2026-10-28 · 15 CVEs total

CVE-2026-118645	8.7 HIGH	n8n before 1.123.85, 2.43.5, and 2.44.1 Filter Injection via Quick Base Node Where Paramet
CVE-2026-118649	8.3 HIGH	n8n before 2.43.5 and 2.44.1 Authorization Bypass via Crafted Workflow ID in Data Tables
CVE-2026-118647	8.2 HIGH	n8n before 1.123.85, 2.43.5, and 2.44.1 SeaTable Trigger API Token Exposure via Execution
CVE-2026-118643	8.2 HIGH	n8n before 1.123.85, 2.43.5, and 2.44.1 Credential Exposure via Node Execution Error Data
CVE-2026-118644	7.7 HIGH	n8n before 2.41.5 and 2.42.2 Credential Theft via Error-Workflow Context Inheritance
CVE-2026-118641	7.5 HIGH	n8n before 1.123.85, 2.43.5, and 2.44.1 OData $filter Injection via Outlook and SharePoint
CVE-2026-118648	7.3 HIGH	n8n before 1.123.85, 2.43.5, and 2.44.1 Stored XSS via Webhook Responses Missing Sandbox P
CVE-2026-118675	7.1 HIGH	n8n before 1.123.85, 2.43.5, and 2.44.1 Credential Guard Bypass via Execute Sub-workflow
CVE-2026-118676	7.1 HIGH	n8n before 1.123.85, 2.43.5, and 2.44.1 Credential Permission Check Bypass
CVE-2026-118642	7.1 HIGH	n8n before 1.123.85, 2.43.5, and 2.44.1 Credential Permission Check Bypass via Inline Sub-
CVE-2026-118678	7.1 HIGH	n8n before 2.41.4 and 2.42.1 Prototype Pollution DoS via Workflow History Compaction
CVE-2026-118646	6.5 MEDIUM	n8n before 1.123.85, 2.43.5, and 2.44.1 ReDoS via Read/Write Files Node
CVE-2026-118677	5.9 MEDIUM	n8n before 2.41.4 and 2.42.1 Local Gateway Deep-Link Silent Re-pairing to Attacker Instanc
CVE-2026-118640	5.4 MEDIUM	n8n before 1.123.85, 2.43.5, and 2.44.1 Chat Hub Authorization Bypass

IV. Related Vulnerabilities

Same product: n8n

Same vendor: n8n-io

Same weakness: CWE-918