{"id":"CVE-2026-18676","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-18676","generatedAt":"2026-10-28T03:32:27.103Z","title":"Due to a CORS misconfiguration a cross-origin fetch() from a malicious page returns the admin JWT and signing material.","description":"The default kuma-cp configuration in Kong Mesh reveals the admin bootstrap token and signing keys to any webpage the operator visits while the control plane is reachable from their browser. Due to a CORS misconfiguration a cross-origin fetch() from a malicious page returns the admin JWT and signing material.","published":"2026-08-12T19:17:31.000Z","lastModified":"2026-10-23T19:10:00.000Z","status":"Awaiting Analysis","sourceIdentifier":"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb","cvss":{"version":"4.0","score":5.1,"severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/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/M"},"cwe":["CWE-346","CWE-942"],"affected":[],"epss":{"score":0.00298,"percentile":0.22321,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.30%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://developer.konghq.com/mesh/changelog/","source":"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"},{"url":"https://github.com/kumahq/kuma/pull/16416","source":"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"},{"url":"https://github.com/kumahq/kuma/pull/16423","source":"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"},{"url":"https://github.com/kumahq/kuma/pull/16424","source":"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"},{"url":"https://github.com/kumahq/kuma/pull/16425","source":"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"},{"url":"https://github.com/kumahq/kuma/pull/16426","source":"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"},{"url":"https://github.com/kumahq/kuma/pull/16427","source":"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"},{"url":"https://github.com/kumahq/kuma/security/advisories/GHSA-3vcp-chfh-f6r2","source":"02762ae7-200e-4b20-9b2b-a77d5b8fc4cb"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-18676","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}