Broken Object-Level Authorization in OpenSignLabs OpenSignServer Product
CVE-2026-72689

7.5HIGH

Key Information:

Vendor

Opensignlabs

Status
Opensignserver
Vendor
CVE Published:
10 August 2026

What is CVE-2026-72689?

A vulnerability in OpenSignLabs' OpenSignServer allows an unauthenticated remote attacker to access complete contract records through the getDocument Parse cloud function. This occurs because the function improperly uses the useMasterKey, allowing it to bypass the object Access Control List (ACL). If the document's IsEnableOTP flag is unset, which is the default setting, full records, including personally identifiable information (PII) of both sender and signer, alongside a pre-signed document download URL, can be retrieved.

Affected Version(s)

opensignserver 0 <= 2.37.0

References

https://github.com/OpenSignLabs/OpenSign
third-party-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Bobur Abdugafforov (Mahadsec)
.