CVE-2026-71417— Lemur: Any user can revoke arbitrary certificates at the CA by uploading a duplicate record and revoking it
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I. Basic Information for CVE-2026-71417
Vulnerability Information
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Vulnerability Title
Lemur: Any user can revoke arbitrary certificates at the CA by uploading a duplicate record and revoking it
Source: CVE Program / CVE List V5
Vulnerability Description
Lemur manages TLS certificate creation. Prior to 1.9.3, POST /api/1/certificates/upload allowed a non-read-only user to create a duplicate row using another certificate body, authority_id, serial, or external_id without requiring permission on the underlying authority. PUT /api/1/certificates//revoke authorized the caller against only the selected Lemur row, so the creator of the duplicate bypassed CertificatePermission. The duplicate had no cert.endpoints, which also bypassed the safeguard that prevents revocation of deployed certificates. Issuer plugins then revoked the real CA-side certificate using certificate.body or external_id under the stored authority credentials. An attacker could therefore revoke arbitrary managed certificates and cause fleet-wide TLS denial of service. The fix rejects duplicate authority_id and serial identities, requires authority access on upload, and checks every matching row during revocation. This issue is fixed in version 1.9.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-71417
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 8487 chars
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III. Intelligence Information for CVE-2026-71417
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Patches & Fixes for CVE-2026-71417 (1)
Vendor Advisories for CVE-2026-71417 (1)
Vendor Pages for CVE-2026-71417 (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-2026-48508 | 8.8 HIGH | Lemur: Authorization bypass in StrictRolePermission / AuthorityCreatorPermission |
| 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-2026-71317 | 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-2026-71322
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 - CVE-2026-71307
Lemur: Authenticated low-privilege users can read plaintext
Same vendor: Netflix
- 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 - CVE-2026-71307
Lemur: Authenticated low-privilege users can read plaintext
Same weakness: CWE-639
- CVE-2026-71308
Lemur: Unchecked `replaces[]` lets any user silence notifica - CVE-2026-69160
OpenList: Arbitrary File Read via Path Prefix Confusion in S - CVE-2026-50167
Kurrier: Authenticated cross-user authorization bypass in Ku - CVE-2026-61574
authentik RAC: access any endpoint via an unrelated applicat - CVE-2026-19869
Privilege Escalation via Dropped Field-Level @authentication
V. Comments for CVE-2026-71417
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