CVE-2026-72543
Received Received - Intake

Insecure Direct Object Reference in OpenSignLabs OpenSign Allows Unauthenticated Contact Record Access

Publication date: 2026-08-11

Last updated on: 2026-08-11

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

Description
An insecure direct object reference vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote attackers to retrieve any contact record via the getcontact Parse cloud function. The function executes with useMasterKey and performs no authentication or authorization checks before returning the requested contact object. An attacker can enumerate and read all contact records including personally identifiable information without credentials.

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Meta Information

Published
2026-08-11
Last Modified
2026-08-11
Generated
2026-08-11
AI Q&A
2026-08-11
EPSS Evaluated
N/A
NVD
CVE-2026-72543
EUVD
EUVD-2026-56013

Affected Vendors & Products

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

Helpful Resources

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 vulnerability is an insecure direct object reference flaw in OpenSignLabs OpenSign version 2.37.0 or earlier. It allows unauthenticated remote attackers to access any contact record by exploiting the getcontact Parse cloud function. The function uses a master key and lacks authentication or authorization checks, enabling attackers to read all contact records including personally identifiable information without credentials.

Detection Guidance

Check OpenSign logs for repeated calls to the getcontact Parse cloud function without authentication. Monitor network traffic for unauthorized access to contact records or unusual API requests targeting OpenSign endpoints.

Impact Analysis

This vulnerability could allow attackers to access and steal sensitive contact information, including personally identifiable information, without any authentication. This may lead to privacy breaches, identity theft, or unauthorized use of personal data.

Compliance Impact

This vulnerability likely violates GDPR and HIPAA by exposing personally identifiable information without proper access controls. GDPR requires strict data protection and user consent, while HIPAA mandates safeguards for protected health information. The flaw could result in non-compliance, legal penalties, and reputational damage.

Mitigation Strategies

Upgrade OpenSign to the latest version beyond 2.37.0. Disable or restrict access to the getcontact function in Parse cloud code. Implement authentication and authorization checks for all contact record access.

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