{"id":"CVE-2026-31309","title":"Improper authorization in the /tequilapi/config/user endpoint of Mysterium Node from v1.21.1-rc0 before v1.36.0 allows an unauthenticated attacker to arbitrarily overwrite the node's configuration and achieve a full node takeover via a c…","summary":"Improper authorization in the /tequilapi/config/user endpoint of Mysterium Node from v1.21.1-rc0 before v1.36.0 allows an unauthenticated attacker to arbitrarily overwrite the node's configuration and achieve a full node takeover via a c…","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-862"],"published":"2026-07-08","updated":"2026-07-16","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-31309","references":[{"url":"https://github.com/mysteriumnetwork/node/","label":"cve@mitre.org"},{"url":"https://github.com/mysteriumnetwork/node/commit/bc099fcaff59fee9c8a8f8e07ffff5b3c5df2bb9","label":"cve@mitre.org"},{"url":"https://github.com/sch8ill/CVE-2026-31309","label":"cve@mitre.org"},{"url":"https://github.com/sch8ill/CVE-2026-31309","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","exploit-available"],"epss":0.0062,"epssPercentile":0.48042,"ingestedAt":"2026-07-17T13:12:07.610Z","exploits":{"github":1,"githubRepos":["https://github.com/Sch8ill/CVE-2026-31309"],"checkedAt":"2026-09-21T15:28:39.218Z"},"exploitAvailable":true,"slug":"CVE-2026-31309","body":"## Overview\n\nImproper authorization in the /tequilapi/config/user endpoint of Mysterium Node from v1.21.1-rc0 before v1.36.0 allows an unauthenticated attacker to arbitrarily overwrite the node's configuration and achieve a full node takeover via a crafted POST request.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"abyssal","depthScore":66,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":5071,"id":"CVE-2026-31309","ts":1788887244107,"field":"exploit_available","old":"false","new":"true"},{"seq":3954,"id":"CVE-2026-31309","ts":1788886363194,"field":"exploit_available","old":"true","new":"false"},{"seq":2775,"id":"CVE-2026-31309","ts":1788883029298,"field":"exploit_available","old":"false","new":"true"},{"seq":1804,"id":"CVE-2026-31309","ts":1788882432825,"field":"exploit_available","old":"true","new":"false"},{"seq":910,"id":"CVE-2026-31309","ts":1788881866290,"field":"exploit_available","old":"false","new":"true"}]}