CVE-2026-71317Public exploit

Trusted certificate issuance via unchecked parent authority

Published Aug 18, 2026 · Updated Aug 19, 2026

Missing authorization in sub-CA creation in Netflix Lemur before 1.9.3 allows remote authenticated users to issue trusted certificates via an unauthorized parent authority. AssociatedAuthoritySchema resolves the caller-supplied parent with fetch_objects, and AuthoritiesList.post passed that object into authority creation without an AuthorityPermission check, allowing cryptography-issuer to sign a new intermediate with the parent authority_certificate.private_key. Exploitation requires an authenticated non-read-only account and the supported configuration with ADMIN_ONLY_AUTHORITY_CREATION disabled; the resulting intermediate can mint certificates under an internal root for which the caller holds no role, and its private key can be used outside Lemur.

CVSS severity6.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in sub-CA creation in Netflix Lemur before 1.9.3 allows remote authenticated users to issue trusted certificates via an unauthorized parent authority. AssociatedAuthoritySchema resolves the caller-supplied parent with fetch_objects, and AuthoritiesList.post passed that object into authority creation without an AuthorityPermission check, allowing cryptography-issuer to sign a new intermediate with the parent authority_certificate.private_key. Exploitation requires an authenticated non-read-only account and the supported configuration with ADMIN_ONLY_AUTHORITY_CREATION disabled; the resulting intermediate can mint certificates under an internal root for which the caller holds no role, and its private key can be used outside Lemur.

The record

CVE
CVE-2026-71317
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
Netflix
Product
Lemur
Classifications
CWE-862, T1649
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.9.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Netflix · Lemurversion=< 1.9.3

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1649Steal or Forge Authentication Certificates

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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