{"cve":"CVE-2026-18676","nvd":{"published":"2026-08-12T19:17:30.813","modified":"2026-10-23T19:10:00.167","status":"Awaiting Analysis","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.","cvss_v4":{"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","score":5.1},"cvss_v3":null,"cwes":["CWE-346","CWE-942"],"references":["https://developer.konghq.com/mesh/changelog/","https://github.com/kumahq/kuma/pull/16416","https://github.com/kumahq/kuma/pull/16423","https://github.com/kumahq/kuma/pull/16424","https://github.com/kumahq/kuma/pull/16425"],"products":[],"source":"nvd","synced_at":"2026-10-24T16:53:35.584907681+00:00"},"epss":{"cve":"CVE-2026-18676","score":0.00298,"percentile":0.22246,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-3vcp-chfh-f6r2","url":"https://osv.dev/vulnerability/GHSA-3vcp-chfh-f6r2","summary":"Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin","modified":"2026-09-10T03:50:45.346790306Z","packages":[{"ecosystem":"Go","name":"github.com/kumahq/kuma","purl":"pkg:golang/github.com/kumahq/kuma","ranges":["<2.7.25"],"fixed":["2.7.25"]},{"ecosystem":"Go","name":"github.com/kumahq/kuma","purl":"pkg:golang/github.com/kumahq/kuma","ranges":[">=2.9.0 <2.9.15"],"fixed":["2.9.15"]},{"ecosystem":"Go","name":"github.com/kumahq/kuma","purl":"pkg:golang/github.com/kumahq/kuma","ranges":[">=2.11.0 <2.11.13"],"fixed":["2.11.13"]},{"ecosystem":"Go","name":"github.com/kumahq/kuma","purl":"pkg:golang/github.com/kumahq/kuma","ranges":[">=2.12.0 <2.12.10"],"fixed":["2.12.10"]},{"ecosystem":"Go","name":"github.com/kumahq/kuma","purl":"pkg:golang/github.com/kumahq/kuma","ranges":[">=2.13.0 <2.13.5"],"fixed":["2.13.5"]}]},{"id":"GO-2026-5102","url":"https://osv.dev/vulnerability/GO-2026-5102","summary":"Default kuma-cp leaks admin token cross-origin via CORS wildcard + LocalhostIsAdmin in github.com/kumahq/kuma","modified":"2026-08-13T04:10:36.471482007Z","packages":[{"ecosystem":"Go","name":"github.com/kumahq/kuma","purl":"pkg:golang/github.com/kumahq/kuma","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/kumahq/kuma/v2","purl":"pkg:golang/github.com/kumahq/kuma/v2","ranges":["<2.7.25",">=2.9.13 <2.11.13",">=2.12.4 <2.12.10",">=2.13.0 <2.13.5"],"fixed":["2.7.25","2.11.13","2.12.10","2.13.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}