{"id":"CVE-2026-105818","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-105818","generatedAt":"2026-10-28T02:24:57.220Z","title":"This may allow an ACME client to obtain a certificate containing unverified identity claims, potentially enabling impersonation toward systems that trust certificates issued by the affected Vault PKI mount.","description":"Vault's PKI secrets engine ACME server did not restrict certificate identities that ACME challenges do not validate when issuing certificates under the default directory policy. This may allow an ACME client to obtain a certificate containing unverified identity claims, potentially enabling impersonation toward systems that trust certificates issued by the affected Vault PKI mount. This vulnerability (CVE-2026-105818) is fixed in Vault Community Edition 2.1.2, and Vault Enterprise 2.1.2, 1.21.12, 1.20.17, and 1.19.23.","published":"2026-10-07T22:17:03.000Z","lastModified":"2026-10-08T21:07:57.000Z","status":"Awaiting Analysis","sourceIdentifier":"security@hashicorp.com","cvss":{"version":"3.1","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},"cwe":["CWE-345"],"affected":[],"epss":{"score":0.0008,"percentile":0.00149,"date":"2026-10-26","history":[{"date":"2026-10-08","score":0.0008,"percentile":0.0014}]},"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 (0.08%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-07T22:17:03.000Z","detail":{"score":"5.9","severity":"MEDIUM","publishedAt":"2026-10-07T22:17:02.843Z"},"summary":"New CVE, medium severity (CVSS 5.9)."}],"references":[{"url":"https://discuss.hashicorp.com/t/hcsec-2026-40-vault-pki-acme-default-directory-policy-may-issue-certificates-with-unverified-identities/77812","source":"security@hashicorp.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-105818","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."}