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CVE-2026-72766— n8n before 1.123.67 Arbitrary File Read via Send Email Node

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-io n8n是n8n-io组织的一款可自托管的工作流自动化平台。 n8n-io n8n 1.123.67之前版本、2.31.5版本之前的2.x版本和2.32.1版本之前的2.32.x版本存在缓冲区错误漏洞，该漏洞源于Send Email节点存在类型混淆漏洞，未强制消息字段为字符串，可能导致攻击者利用特制非字符串值进行任意本地文件泄露和服务端请求伪造（SSRF）。

CVSS 8.2 · High EPSS 0.44% · P36

Affected Version Matrix 6

VendorProduct Version RangeStatus
n8n-io n8n < 1.123.67 affected
1.123.67 unaffected
< 2.32.1 affected
2.32.1 unaffected
< 2.31.5 affected
2.31.5 unaffected
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I. Basic Information for CVE-2026-72766

Vulnerability Information
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Vulnerability Title
n8n before 1.123.67 Arbitrary File Read via Send Email Node
Source: CVE Program / CVE List V5
Vulnerability Description
n8n before 1.123.67, 2.x before 2.31.5, and 2.32.x before 2.32.1 contain a type confusion vulnerability in the Send Email node, which does not enforce that its message fields are strings. A crafted non-string value supplied from a workflow expression into the text or HTML body field can be interpreted by the underlying mail library (Nodemailer) as a file path or URL, allowing arbitrary local file disclosure and server-side request forgery (SSRF). Exploitation requires a pre-existing active workflow with an unauthenticated webhook, valid SMTP credentials configured on the node, and untrusted input mapped directly into the body field; this is not a default configuration.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
Source: CVE Program / CVE List V5
Vulnerability Title
n8n-io n8n 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
n8n-io n8n是n8n-io组织的一款可自托管的工作流自动化平台。 n8n-io n8n 1.123.67之前版本、2.31.5版本之前的2.x版本和2.32.1版本之前的2.32.x版本存在缓冲区错误漏洞，该漏洞源于Send Email节点存在类型混淆漏洞，未强制消息字段为字符串，可能导致攻击者利用特制非字符串值进行任意本地文件泄露和服务端请求伪造（SSRF）。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
n8n-io n8n 0 ~ 1.123.67 -
n8n-io n8n 0 ~ 2.32.1 -
n8n-io n8n 0 ~ 2.31.5 -

II. Public POCs for CVE-2026-72766

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III. Intelligence Information for CVE-2026-72766

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Vendor Advisories for CVE-2026-72766 (2)

Same Patch Batch · n8n-io · 2026-08-11 · 16 CVEs total

CVE-2026-72772 8.9 HIGH n8n before 2.32.1 Authentication Bypass via Token Exchange
CVE-2026-72765 8.7 HIGH n8n before 2.32.1 Remote Code Execution via Expression Sandbox Escape
CVE-2026-72767 8.7 HIGH n8n before 1.123.67 Remote Code Execution via Git node
CVE-2026-72762 7.7 HIGH n8n before 1.123.67 Arbitrary File Write via Edit Image Node
CVE-2026-72763 7.2 HIGH n8n before 1.123.67 Credential Exfiltration via Sub-Workflow
CVE-2026-72771 7.1 HIGH n8n before 2.32.1 Credential Restriction Bypass via AI/LLM Nodes
CVE-2026-72774 7.1 HIGH n8n before 1.123.67 Authentication Bypass via HTTP Request Node
CVE-2026-72770 7.1 HIGH n8n before 1.123.67 Path Traversal via Git Node Operations
CVE-2026-72749 7.1 HIGH n8n before 1.123.67 Prototype Pollution via Edit Fields
CVE-2026-72768 6.4 MEDIUM n8n before 2.32.1 SSRF Protection Bypass via MCP Client
CVE-2026-72769 6.1 MEDIUM n8n before 1.123.67 Prototype Pollution via VM Expression Engine
CVE-2026-72775 5.8 MEDIUM n8n before 1.123.67 SQL Injection via PostgresTrigger Node
CVE-2026-72764 5.8 MEDIUM n8n before 1.123.67 Module Cache Poisoning via Code Node
CVE-2026-72750 5.3 MEDIUM n8n before 1.123.67 SQL Injection via executeQuery Operation
CVE-2026-72773 4.9 MEDIUM n8n before 2.32.1 Path Traversal via computer-use search_files

IV. Related Vulnerabilities

Same product: n8n
Same vendor: n8n-io
Same weakness: CWE-843

V. Comments for CVE-2026-72766

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