CVE-2026-110623: Papermerge Papermerge-Core

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

Papermerge Core through 3.5.3 contains a missing authorization vulnerability in the shared nodes API that allows authenticated users to share other users' documents by supplying arbitrary node UUIDs. Attackers can call POST /shared-nodes or PATCH /shared-nodes/access/{node_id} to grant themselves any role, then read, modify, or delete victims' documents and revoke existing shares.

Affected products

• Papermerge Papermerge-Core: up to and including 3.5.3

Published 2026-10-14. Last modified 2026-10-16.