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CVE-2026-92794 – Unauthenticated Information Disclosure – OpenSign ≤ 2.41.3

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Summary

CVE-2026-92794 is a missing-authorization vulnerability in OpenSign, an open-source document signing platform. The flaw resides in the getDocument cloud function, which fails to validate caller identity when one-time-password (OTP) verification is disabled for a document, allowing an unauthenticated attacker to retrieve complete document records — including signer and sender identity and valid download tokens. The vulnerability is rated HIGH severity (CVSS 8.7).

Technical details

  • Root cause: the getDocument cloud function performs its lookup using a master key and returns the full document object whenever the document’s IsEnableOTP flag is false, without verifying that the caller is authorized to view that document.
  • Trigger condition: an attacker only needs a valid document identifier (obtainable from a guest signing link) for a document where OTP verification has not been enabled.
  • Attack vector: network-based, low complexity, no authentication or user interaction required.
  • Impact: disclosure of complete document details, including signer information, sender identity, and valid document download tokens, without any authentication.

Affected software

  • OpenSign (OpenSignLabs), versions up to and including 2.41.3.

Severity

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

Mitigation and recommended actions

  • Immediate: upgrade OpenSign to a version beyond 2.41.3 where this issue has been addressed.
  • If a patch cannot be applied immediately:
    • Enable OTP verification (IsEnableOTP) on all documents to require an authenticated verification step before document data can be retrieved.
    • Restrict or monitor access to the getDocument cloud function endpoint, and treat guest signing link identifiers as sensitive values.
    • Review document access/audit logs for unexpected getDocument calls using known or guessable document identifiers.

References

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