Internal service access via LLM-generated request URLs
Published Apr 23, 2026 · Updated Apr 23, 2026
SSRF in FlowiseAI Flowise before 3.1.0 allows remote attackers to access internal services through GET and POST API Chain requests. The API Chain implementation parses an LLM-generated URL from JSON and passes it directly to fetch without checking it against the configured API documentation. A reachable chatflow containing either API Chain component lets unauthenticated requests override the documented base URL, enabling internal reconnaissance and data access through services reachable from the server.
Summary
What happened
SSRF in FlowiseAI Flowise before 3.1.0 allows remote attackers to access internal services through GET and POST API Chain requests. The API Chain implementation parses an LLM-generated URL from JSON and passes it directly to fetch without checking it against the configured API documentation. A reachable chatflow containing either API Chain component lets unauthenticated requests override the documented base URL, enabling internal reconnaissance and data access through services reachable from the server.
The record
- CVE
- CVE-2026-41271
- Published
- Apr 23, 2026
- Updated
- Apr 23, 2026
- Vendor
- FlowiseAI
- Product
- Flowise
- Classifications
- CWE-918, CAPEC-664, T1090.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 23, 2026CVE publishedPublication date reported by the CVE source.
- Apr 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=< 3.1.0
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
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
- Vendor-advisory API Chain SSRF proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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