{"id":"CVE-2026-71303","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-71303","summary":"Lemur manages TLS certificate creation. Prior to 1.9.3, _validate_acme_url enforced ACME_DIRECTORY_HOST_ALLOWLIST when an authority was created, but PUT /api/1/authorities/ passed options…","details":"Lemur manages TLS certificate creation. Prior to 1.9.3, _validate_acme_url enforced ACME_DIRECTORY_HOST_ALLOWLIST when an authority was created, but PUT /api/1/authorities/ passed options to lemur/authorities/service.py without applying the same check. A user holding an authority role could replace the stored acme_url with an internal service or instance-metadata URL such as 169.254.169.254. The next issuance operation loaded that value and passed it to ClientV2.get_directory, causing an outbound request from the Lemur backend. This bypassed the creation-time mitigation for CVE-2026-55166 and could expose internal services or cloud metadata. The fix revalidates acme_url whenever authority options are updated. This issue is fixed in version 1.9.3.","published":"2026-08-18T20:17:23.403","modified":"2026-08-18T20:17:23.403","cvss":{"score":7.7,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/Netflix/lemur/commit/edca0390f930344d65ff4ca37a669c2320e3dfad","label":"Netflix/lemur@edca039"},"references":[{"type":"WEB","url":"https://github.com/Netflix/lemur/commit/edca0390f930344d65ff4ca37a669c2320e3dfad"},{"type":"WEB","url":"https://github.com/Netflix/lemur/releases/tag/v1.9.3"},{"type":"WEB","url":"https://github.com/Netflix/lemur/security/advisories/GHSA-v5rc-cpwc-cfpr"},{"type":"WEB","url":"https://github.com/Netflix/lemur/security/advisories/GHSA-v5rc-cpwc-cfpr"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-18T20:17:23.403"}}