{"id":"CVE-2026-31848","state":"PUBLISHED","title":"Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+","description":"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.","publishedAt":"2026-03-23T12:09:30.338Z","updatedAt":"2026-08-10T11:43:41.847Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"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","source":"TuranSec"},"assigner":"TuranSec","products":["Nexxt Solutions Nebula 300+"],"affected":[{"vendor":"Nexxt Solutions","product":"Nebula 300+","defaultStatus":"affected","versions":[{"version":"<= 12.01.01.37","status":"affected"}]}],"references":["https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/","https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip"],"weaknesses":["CWE-312"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31848.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31848","state":"PUBLISHED","datePublished":"2026-03-23T12:09:30.338Z","dateUpdated":"2026-08-10T11:43:41.847Z","assignerShortName":"TuranSec","assignerOrgId":"309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c","dateReserved":"2026-03-09T18:20:23.399Z"},"containers":{"cna":{"title":"Reversible ecos_pw Cookie Allows Authentication Bypass in Nexxt Nebula 300+","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."}],"affected":[{"vendor":"Nexxt Solutions","product":"Nebula 300+","defaultStatus":"affected","versions":[{"version":"<= 12.01.01.37","status":"affected"}]}],"references":[{"url":"https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/","name":"Official product page","tags":["third-party-advisory"]},{"url":"https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip","name":"Firmware download","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-312","lang":"en","description":"CWE-312 Cleartext Storage of Sensitive Information","type":"CWE"}]}],"providerMetadata":{"shortName":"TuranSec","orgId":"309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c","dateUpdated":"2026-08-10T11:43:41.847Z"},"impacts":[{"descriptions":[{"lang":"en","value":"An attacker who obtains or reconstructs the ecos_pw cookie value can authenticate as an administrator and gain unauthorized access to the device."}]}],"credits":[{"lang":"en","value":"Angel Barre (call4pwn)","type":"finder"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.1"},"datePublic":"2026-03-23T12:09:30.338Z"},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-23T15:16:34.823978Z","id":"CVE-2026-31848","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-03-23T15:51:59.795Z"}}]}}}