File disclosure and SSRF via content type confusion
Published Sep 3, 2026 · Updated Sep 3, 2026
SSRF and local file disclosure in n8n before 1.123.73, 2.35.4, and 2.36.2 allow remote authenticated users to expose host data. The Gmail (v1) and Brevo nodes pass expression-resolved message content to the mail composer without a string type check, so path and href object properties trigger file reads or URL fetches that become message attachments. Workflow execution access is required; disclosure is limited to files readable by the n8n process and addresses reachable from it.
Summary
What happened
SSRF and local file disclosure in n8n before 1.123.73, 2.35.4, and 2.36.2 allow remote authenticated users to expose host data. The Gmail (v1) and Brevo nodes pass expression-resolved message content to the mail composer without a string type check, so path and href object properties trigger file reads or URL fetches that become message attachments. Workflow execution access is required; disclosure is limited to files readable by the n8n process and addresses reachable from it.
The record
- CVE
- CVE-2026-85170
- Published
- Sep 3, 2026
- Updated
- Sep 3, 2026
- Vendor
- n8n
- Product
- n8n
- Classifications
- T1005
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 3, 2026CVE publishedPublication date reported by the CVE source.
- Sep 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <1.123.73
- Affected versionversion=0 <2.35.4
- Affected versionversion=0 <2.36.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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