CVE-2026-67620
Flowise 3.1.4 SSRF via fetch-links Endpoint Incomplete Deny-List
- State
- Published
- Severity
- 6.3 Medium
- Published
- Aug 8, 2026
- Updated
- Aug 14, 2026
- Reserved
- Jul 29, 2026
Description
Flowise through 3.1.4 contains a server-side request forgery vulnerability in the SSRF guard implemented in httpSecurity.ts, where the DEFAULT_DENY_LIST omits the Oracle Cloud Infrastructure metadata endpoint 192.0.0.192 and the Alibaba Cloud metadata endpoint 100.100.100.200, allowing authenticated attackers to force the server to issue arbitrary GET requests to cloud instance metadata services. Attackers can send requests to the fetch-links API endpoint with a crafted URL parameter, bypassing deny-list validation including redirect-based bypasses, to reach instance metadata services and expose instance identity data and role credentials on Oracle Cloud Infrastructure or Alibaba Cloud deployments, with unauthenticated access possible when URL-fetching nodes exist in public chatflows.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N | VulnCheck |
| 3.1 | 7.7 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-918 Server-Side Request Forgery (SSRF)
Affected Products
| Product | Versions |
|---|---|
FlowiseFlowiseAI |
|
References
- Researcher Disclosuretechnical-descriptionexploit
- Sunset Announcementvendor-advisory
- https://www.vulncheck.com/advisories/flowise-ssrf-via-fetch-links-endpoint-incomplete-deny-listthird-party-advisory
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