CVE-2026-72689
Received Received - Intake

Broken Object-Level Authorization in OpenSignLabs OpenSignServer

Publication date: 2026-08-10

Last updated on: 2026-08-10

Assigner: 309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c

Description
A broken object-level authorization vulnerability in OpenSignLabs opensignserver through 2.37.0 allows an unauthenticated remote attacker to read complete contract records via the getDocument Parse cloud function. The function fetches documents using useMasterKey, bypassing the object ACL, and returns full records including sender and signer PII and a pre-signed document download URL whenever the document's IsEnableOTP flag is unset, which is the default configuration.

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Meta Information

Published
2026-08-10
Last Modified
2026-08-10
Generated
2026-08-10
AI Q&A
2026-08-10
EPSS Evaluated
N/A
NVD
CVE-2026-72689
EUVD
EUVD-2026-55524

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
opensignlabs opensignserver 2.37.0

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

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Executive Summary

This is a broken object-level authorization vulnerability in OpenSignLabs opensignserver through version 2.37.0. An unauthenticated remote attacker can read complete contract records by exploiting the getDocument Parse cloud function. The function uses useMasterKey to bypass object access controls, returning full records including sender and signer personally identifiable information (PII) and a pre-signed document download URL when the document's IsEnableOTP flag is unset, which is the default setting.

Impact Analysis

An attacker could access sensitive contract data, including PII of senders and signers, and obtain pre-signed document download URLs. This could lead to unauthorized access to confidential information, potential data breaches, and misuse of personal data.

Compliance Impact

This vulnerability likely violates GDPR and HIPAA by exposing personally identifiable information without authorization. It could result in non-compliance with data protection requirements, leading to legal penalties, fines, and reputational damage for organizations handling sensitive data.

Mitigation Strategies

Update OpenSignLabs opensignserver to a version beyond 2.37.0 where the vulnerability is patched. Disable the useMasterKey flag in the getDocument Parse cloud function to enforce proper object ACL checks.

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