SSRF in Flowiseai Flowise
CVE-2026-69257
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, Flowise's HTTP security module httpSecurity.ts did not normalize IPv4-mapped IPv6 addresses such as ::ffff:127.0.0.1 and ::ffff:169.254.169.254 before checking them against the deny list. Because ipaddr.js reports these addresses as ipv6 while IPv4 CIDR deny-list entries are ipv4, isDeniedIP() skipped the IPv4 CIDR checks. An attacker who controls DNS resolution for a hostname used by the HTTP Node, API Chain, Document Loader, MCP tool, or other paths using secureAxiosRequest(), secureFetch(), or checkDenyList() could return a AAAA record for an IPv4-mapped target and cause requests to reach localhost, internal services, or cloud metadata endpoints. This issue is fixed in version 3.1.3.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (37.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Flowiseai Flowise — versions < 3.1.3
Weakness classification (CWE)
References
- github.com/FlowiseAI/Flowise/security/advisories/GHSA-c6xh-wv4j-ppv5 (Exploit, Mitigation, Vendor Advisory)
- github.com/FlowiseAI/Flowise/pull/6431 (Patch, Issue Tracking)
- github.com/FlowiseAI/Flowise/commit/0fc769208395641c1411ccdb9c81416e54802155 (Patch)
- github.com/FlowiseAI/Flowise/releases/tag/flowise@3.1.3 (Patch, Release Notes)
Frequently asked questions
- What is CVE-2026-69257?
- CVE-2026-69257 is a high-severity vulnerability in Flowiseai Flowise, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-08-04.
- How severe is CVE-2026-69257?
- High severity. CVSS v3 base score is 8.6 out of 10.