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TI-2026-35868 Aliases CVE-2026-48508GHSA-qcqw-jwxc-2hqg

Lemur: Authorization bypass in StrictRolePermission / AuthorityCreatorPermission

Priority MEDIUM 40CWE-863Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00329 26th percentileScored 2026-11-07
Fix Fixed lemur (Netflix): 1.9.1lemur (PyPI): 1.9.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Netflixlemurbefore 1.9.11.9.1Patch availableCNA
—lemur (PyPI)before 1.9.11.9.1Patch availableGHSA-qcqw-jwxc-2hqg
  • lemur VendorNetflix Affected before 1.9.1 Fixed in 1.9.1 Patch available CNA
  • lemur (PyPI) Vendor— Affected before 1.9.1 Fixed in 1.9.1 Patch available GHSA-qcqw-jwxc-2hqg

Remediation

  • Fix · CNA lemur (Netflix) Fixed in 1.9.1
  • Fix · GHSA-qcqw-jwxc-2hqg lemur (PyPI) Fixed in 1.9.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-48508
  2. 2026-10-03 Alias added: GHSA-qcqw-jwxc-2hqg

References

Other 4

  • TI-2024-04374 Path Traversal vulnerability via File Uploads in Genie CVSS 3.1CRITICAL 9.9
  • TI-2023-21044 Dispatch writes JWT tokens in error message CVSS 3.1CRITICAL 9.1
  • TI-2026-39854 Improper authorization in Netflix lemur CVSS 3.1CRITICAL 9.9
  • TI-2026-32272 Lemur: LDAP Filter Injection enables post-authentication privilege escalation CVSS 3.1HIGH 8.1
  • TI-2026-49966 Lemur: Unchecked `replaces[]` lets any user silence notifications and hijack auto-rotation for arbitrary certificates CVSS 3.1HIGH 8.1
  • TI-2026-49965 Missing authorization in Netflix lemur CVSS 3.1HIGH 7.7
See all 33 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences