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CVE-2026-48508— Lemur: Authorization bypass in StrictRolePermission / AuthorityCreatorPermission

Quick assessment

Affected
Netflix lemur
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netflix lemur是美国Netflix公司开源的一个证书管理工具。 Netflix Lemur 1.9.1之前版本存在授权问题漏洞，该漏洞源于在权限检查中调用flask_principal.Permission.__init__时传入零个Need对象，导致授权门禁对所有已认证身份开放，只读用户可创建根证书颁发机构、上传任意证书、创建或编辑通知等。

CVSS 8.8 · High EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1078.003 · Local Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
Netflix lemur < 1.9.1 affected
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I. Basic Information for CVE-2026-48508

Vulnerability Information
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Vulnerability Title
Lemur: Authorization bypass in StrictRolePermission / AuthorityCreatorPermission
Source: CVE Program / CVE List V5
Vulnerability Description
Lemur manages TLS certificate creation. Prior to 1.9.1, StrictRolePermission and AuthorityCreatorPermission in lemur/auth/permissions.py call flask_principal.Permission.__init__() with zero Need objects when ADMIN_ONLY_AUTHORITY_CREATION and LEMUR_STRICT_ROLE_ENFORCEMENT are unset because both flags default to False. Flask-Principal Permission.allows() returns True when self.needs is empty, so the .can() authorization gate permits every authenticated identity, including the read-only role. A read-only user can access POST /api/1/authorities, POST /api/1/certificates/upload, POST /api/1/pending_certificates//upload, POST /api/1/notifications, PUT or DELETE /api/1/notifications/, and POST /api/1/domains to create root Certificate Authorities, upload arbitrary certificates, create or edit notifications that reach an SSRF sink, and create domain entries. Explicitly setting either flag to False continues to opt into the permissive behavior. This issue is fixed in version 1.9.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Netflix Lemur 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netflix lemur是美国Netflix公司开源的一个证书管理工具。 Netflix Lemur 1.9.1之前版本存在授权问题漏洞，该漏洞源于在权限检查中调用flask_principal.Permission.__init__时传入零个Need对象，导致授权门禁对所有已认证身份开放，只读用户可创建根证书颁发机构、上传任意证书、创建或编辑通知等。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Netflix lemur < 1.9.1 -

II. Public POCs for CVE-2026-48508

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Qwen3.6-35B-A3B · 9288 chars
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III. Intelligence Information for CVE-2026-48508

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Patches & Fixes for CVE-2026-48508 (1)

Vendor Advisories for CVE-2026-48508 (1)

Vendor Pages for CVE-2026-48508 (1)

Same Patch Batch · Netflix · 2026-08-18 · 14 CVEs total

CVE-2026-55166 9.9 CRITICAL Lemur: any SSO-authenticated user achieves AWS IAM compromise and permanent PKI key access
CVE-2026-71308 8.1 HIGH Lemur: Unchecked `replaces[]` lets any user silence notifications and hijack auto-rotation
CVE-2026-71307 7.7 HIGH Lemur: Authenticated low-privilege users can read plaintext destination credentials (SFTP
CVE-2026-71303 7.7 HIGH Lemur: Incomplete fix for CVE-2026-55166 -- ACME authority update endpoint allows non-admi
CVE-2026-70666 7.4 HIGH Lemur: Server-Side Request Forgery via the ACME client following server-controlled URLs
CVE-2026-71417 7.3 HIGH Lemur: Any user can revoke arbitrary certificates at the CA by uploading a duplicate recor
CVE-2026-71317 6.5 MEDIUM Lemur: Sub-CA creation never checks `AuthorityPermission` on the parent authority
CVE-2026-70667 6.3 MEDIUM Lemur: SSRF protection in certificate revocation checking bypassable via HTTP redirects an
CVE-2026-55162 6.3 MEDIUM Lemur: Post-authentication SSRF via certificate verification - attacker-controlled CRL and
CVE-2026-55163 6.3 MEDIUM Lemur: Privilege escalation via PUT /api/1/roles/<id> — non-admin role members can rewrite
CVE-2026-55164 4.9 MEDIUM Lemur: Plaintext password storage in Lemur user-update path
CVE-2026-55165 4.8 MEDIUM Lemur : JWT verifier trusts attacker-supplied alg from token header — defense-in-depth gap
CVE-2026-71322 4.3 MEDIUM Lemur: Missing authorization check on POST /certificates/<id>/export for plugins with requ

IV. Related Vulnerabilities

Same product: lemur
Same vendor: Netflix
Same weakness: CWE-863

V. Comments for CVE-2026-48508

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