{"apiVersion":"1.0","identifier":"CVE-2026-71303","description":"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.","publishedAt":"2026-08-18T20:17:23","lastModifiedAt":"2026-08-18T20:17:23","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-71303","cvssScore":7.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","epssProbability":0.00211,"riskScore":0.78,"affectedProduct":"Lemur","affectedVersions":"<1.9.3","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-71303","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-71303","en":"https://www.redsauce.net/en/cves/CVE-2026-71303","fr":"https://www.redsauce.net/fr/cves/CVE-2026-71303","pt":"https://www.redsauce.net/pt/cves/CVE-2026-71303","de":"https://www.redsauce.net/de/cves/CVE-2026-71303","sk":"https://www.redsauce.net/sk/cves/CVE-2026-71303","el":"https://www.redsauce.net/el/cves/CVE-2026-71303"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-71303"}}