Cross-site request forgery via null Origin bypass
Published Apr 20, 2026 · Updated Apr 20, 2026
Cross-site request forgery in ComfyUI 0.1 through 0.13.0 allows remote attackers to submit state-changing requests through a victim's browser. create_origin_only_middleware parses Origin: null with urlparse(), obtains an empty netloc, and skips validation when the resulting origin domain has zero length. A victim must visit attacker-controlled content; even a default localhost-bound instance is browser-reachable, allowing unauthorized uploads or workflow submission.
Summary
What happened
Cross-site request forgery in ComfyUI 0.1 through 0.13.0 allows remote attackers to submit state-changing requests through a victim's browser. create_origin_only_middleware parses Origin: null with urlparse(), obtains an empty netloc, and skips validation when the resulting origin domain has zero length. A victim must visit attacker-controlled content; even a default localhost-bound instance is browser-reachable, allowing unauthorized uploads or workflow submission.
The record
- CVE
- CVE-2026-6589
- Published
- Apr 20, 2026
- Updated
- Apr 20, 2026
- Vendor
- Comfy Org
- Product
- ComfyUI
- Classifications
- CWE-352, CWE-862, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 20, 2026CVE publishedPublication date reported by the CVE source.
- Apr 20, 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
- Affected versionversion=0.10
- Affected versionversion=0.11
- Affected versionversion=0.12
- Affected versionversion=0.13.0
- Affected versionversion=0.2
- Affected versionversion=0.3
- Affected versionversion=0.4
- Affected versionversion=0.5
- Affected versionversion=0.6
- Affected versionversion=0.7
- Affected versionversion=0.8
- Affected versionversion=0.9
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Origin null CSRF bypass proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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