Medium 6.5Published Aug 18, 2026

CVE-2026-71317Lemur: Sub-CA creation never checks `AuthorityPermission` on the parent authority

Updated under an hour ago (2026-10-19 08:30 UTC)

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Exploited in the last 30 days

Lemur manages TLS certificate creation. Prior to 1.9.3, POST /api/1/authorities with type=subca did not require AuthorityPermission on the parent authority when ADMIN_ONLY_AUTHORITY_CREATION was false. AssociatedAuthoritySchema resolved the caller-supplied parent and passed it through authority creation to cryptography-issuer, which used the parent authority_certificate.private_key to sign a new intermediate. Any authenticated non-read-only user in that supported configuration could chain a sub-CA to an internal root for which the user held no role. The resulting intermediate could issue trusted certificates and its private key could be used outside Lemur, bypassing normal issuance controls. The fix checks AuthorityPermission on every supplied parent before invoking the issuer. This issue is fixed in version 1.9.3.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Aug 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Netflix lemur netflix:lemur (from the name)	before 1.9.3	CNA record

References

https://github.com/Netflix/lemur/security/advisories/GHSA-g7p5-89mh-248hx-refsource-confirm
https://github.com/Netflix/lemur/commit/8669011203ca3dd89d9e39bab9ef6850eca723f9x-refsource-misc
https://github.com/Netflix/lemur/releases/tag/v1.9.3x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.