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CVE-2026-82472 – Unauthenticated File Upload / Storage Exhaustion DoS – Documenso before 2.13.0

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Summary

CVE-2026-82472 is a missing-authentication vulnerability in Documenso, the open-source document signing platform, affecting all versions before 2.13.0. The /api/files/upload-pdf endpoint accepts PDF file uploads without requiring authentication, session tokens, or API credentials, allowing remote unauthenticated attackers to abuse the endpoint. The issue carries a High severity rating (CVSS v4.0 8.7).

Technical details

  • Root cause: The /api/files/upload-pdf endpoint fails to enforce authentication (CWE-306: Missing Authentication for Critical Function).
  • Trigger conditions: No special conditions are required — the endpoint is reachable over the network without credentials.
  • Attack vector: Network (AV:N), low attack complexity, no privileges or user interaction required.
  • Impact: Attackers can upload arbitrary PDF files indefinitely, exhausting storage resources and/or populating the database with unlinked (orphaned) document records, leading to denial of service / resource exhaustion. No confidentiality or integrity impact was reported.

Affected software

  • Documenso versions prior to 2.13.0 (all versions from 0 up to but not including 2.13.0)

Severity

  • CVSS v4.0: 8.7 (High) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  • CVSS v3.1: 7.5 (High) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Mitigation and recommended actions

  • Immediate: Upgrade Documenso to version 2.13.0 or later, which addresses the missing authentication check on the upload endpoint.
  • If no patch can be applied immediately: Restrict network access to the /api/files/upload-pdf endpoint (e.g., via reverse proxy or firewall rules limiting it to authenticated/trusted sources), and monitor storage/database growth for signs of abuse until the upgrade can be performed.

References

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