Internal network access via unvalidated base URL
Published Jun 23, 2026 · Updated Jun 23, 2026
Server-side request forgery in Flowise before 3.1.0 allows remote authenticated users to send requests to internal network services. The Execute Flow node passes its base URL into an HTTP request without calling secureFetch, so checkDenyList and resolveAndValidate in httpSecurity.ts never inspect intranet destinations. A low-privileged API key and a reachable flow with an attacker-controlled base URL are required; successful requests can read cloud metadata and enumerate internal services.
Summary
What happened
Server-side request forgery in Flowise before 3.1.0 allows remote authenticated users to send requests to internal network services. The Execute Flow node passes its base URL into an HTTP request without calling secureFetch, so checkDenyList and resolveAndValidate in httpSecurity.ts never inspect intranet destinations. A low-privileged API key and a reachable flow with an attacker-controlled base URL are required; successful requests can read cloud metadata and enumerate internal services.
The record
- CVE
- CVE-2026-56275
- Published
- Jun 23, 2026
- Updated
- Jun 23, 2026
- Vendor
- FlowiseAI
- Product
- Flowise
- Classifications
- CWE-918, T1190
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 23, 2026CVE publishedPublication date reported by the CVE source.
- Jun 23, 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 <3.1.0
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
- Execute Flow SSRF request demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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