{"id":"CVE-2026-31848","title":"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","summary":"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 integr…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-312"],"vendor":"nexxtsolutions","product":"nebula300plus_firmware","affected":["nebula300plus_firmware <= 12.01.01.37"],"published":"2026-03-23","updated":"2026-08-10","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-31848","references":[{"url":"https://nexxt-connectivity-frontend.s3.amazonaws.com/media/docs/Nebula300+_v12.01.01.37.zip","label":"309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"},{"url":"https://www.nexxtsolutions.com/connectivity/internal-products/ARN02304U6/","label":"309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"}],"tags":["nvd"],"epss":0.00281,"epssPercentile":0.20844,"ingestedAt":"2026-08-10T12:39:46.337Z","slug":"CVE-2026-31848","body":"## Overview\n\nNexxt 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.\n\n## Affected\n\n- `nebula300plus_firmware <= 12.01.01.37`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}