Stored XSS via attacker-controlled attachment MIME type
Published Apr 29, 2025 · Updated Apr 29, 2025
Stored XSS in n8n before 1.90.0 allows remote authenticated users to execute script in another user's session through a crafted attachment. The binary-data view endpoint accepts a GET-controlled MIME type and serves uploaded HTML as text/html instead of constraining or sandboxing it. Member-level access is required to upload the file, and a second user must open its URL; the resulting session-context script can change that user's account email and enable account takeover.
Summary
What happened
Stored XSS in n8n before 1.90.0 allows remote authenticated users to execute script in another user's session through a crafted attachment. The binary-data view endpoint accepts a GET-controlled MIME type and serves uploaded HTML as text/html instead of constraining or sandboxing it. Member-level access is required to upload the file, and a second user must open its URL; the resulting session-context script can change that user's account email and enable account takeover.
The record
- CVE
- CVE-2025-46343
- Published
- Apr 29, 2025
- Updated
- Apr 29, 2025
- Vendor
- n8n
- Product
- n8n
- Classifications
- CWE-87, T1203
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 29, 2025CVE publishedPublication date reported by the CVE source.
- Apr 29, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 1.90.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
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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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