CVE-2026-31848

import base64 def forge_cookie(creds, suffix): # Encode credentials and append static suffix forged = base64.b64encode(creds.encode()).decode() + suffix return forged # Example print(forge_cookie('admin:admin', 'static_suffix'))

{"cve": {"id": "CVE-2026-31848", "sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "published": "2026-03-23T13:16:30.490", "lastModified": "2026-04-29T17:45:08.690", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Nexxt Solutions Nebula 300+ firmware through version 12.01.01.37 uses the ecos_pw cookie for authentication, which contains Base64-encoded credential data combined with a static suffix. Because the encoding is reversible and lacks integrity protection, an attacker can reconstruct or forge a valid cookie value without proper authentication. This allows unauthorized administrative access to protected endpoints."}, {"lang": "es", "value": "El firmware de Nexxt Solutions Nebula 300+ hasta la versión 12.01.01.37 almacena material de autenticación administrativa en la cookie ecos_pw utilizando un formato codificado en Base64 reversible con un sufijo estático. Un atacante que obtiene o deriva este valor de cookie puede falsificar una sesión administrativa válida y obtener acceso no autorizado al dispositivo."}], "metrics": {"cvssMetricV40": [{"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/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": 8.7, "baseSeverity": "HIGH", "attackVector": "ADJACENT", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "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:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-312"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:nexxtsolutions:nebula300plus_firmware:*:*:*:*:*:*:*:*", "versionEndIncluding": "12.01.01.37", "matchCriteriaId": "D55E0FD8-9ADB-423B-A23F-64F41F9DD40B"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:nexxtsolutions:nebula300plus:-:*:*:*:*:*:*:*", "matchCriteriaId": "F9AA93D2-E1BA-4EFC-8760-BF366CF6474D"}]}]}], "references": [{"url": "https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "tags": ["Product"]}, {"url": "https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "tags": ["Product"]}]}}