CVE-2026-48508— Lemur: Authorization bypass in StrictRolePermission / AuthorityCreatorPermission
Possible ATT&CK Techniques 1AI
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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
Affected Products
II. Public POCs for CVE-2026-48508
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
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)
- 🔗 Release v1.9.1 · Netflix/lemur · GitHubx_refsource_MISC
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
- CVE-2026-71417
Lemur: Any user can revoke arbitrary certificates at the CA - CVE-2026-71322
Lemur: Missing authorization check on POST /certificates/<id - CVE-2026-71317
Lemur: Sub-CA creation never checks `AuthorityPermission` on - CVE-2026-70666
Lemur: Server-Side Request Forgery via the ACME client follo - CVE-2026-71303
Lemur: Incomplete fix for CVE-2026-55166 -- ACME authority u
Same vendor: Netflix
- CVE-2026-71417
Lemur: Any user can revoke arbitrary certificates at the CA - CVE-2026-71322
Lemur: Missing authorization check on POST /certificates/<id - CVE-2026-71317
Lemur: Sub-CA creation never checks `AuthorityPermission` on - CVE-2026-70666
Lemur: Server-Side Request Forgery via the ACME client follo - CVE-2026-71303
Lemur: Incomplete fix for CVE-2026-55166 -- ACME authority u
Same weakness: CWE-863
- CVE-2026-19670
Incorrect Authorization in CISA Malcolm - CVE-2026-55163
Lemur: Privilege escalation via PUT /api/1/roles/<id> — non- - CVE-2026-45122
MyBB: Insufficient permission check for calendar event move - CVE-2026-45121
MyBB: Insufficient permission check for calendar select - CVE-2026-70657
Copyparty: file/dirkey confusion
V. Comments for CVE-2026-48508
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