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9.4

Papermerge Core lets users share others' documents

CVE-2026-110623 · published 1 day ago
Summary

Versions of Papermerge Core up to 3.5.3 let a logged‑in user give themselves access to any document by guessing its internal ID. This could let them read, change or delete other users' files and remove existing sharing settings. Upgrade to a newer version or apply the provided patch to enforce proper permission checks.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
papermerge papermerge-core <= 3.5.3
Original advisory text
Papermerge Core through 3.5.3 Missing Authorization in Shared Nodes API
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit (estimated)
  • Gives an attacker full control (estimated)
Severity
9.4 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-862Missing Authorization
Timeline
Published14 Oct 2026
Updated15 Oct 2026
First seen14 Oct 2026
Sources
CVE-2026-110623 · NVD
CVE-2026-110623 · MITRE
CVE-2026-110623 · OSV
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