Read the docs
TI-2026-50927 Aliases CVE-2026-72689GHSA-mgm4-2355-58g4

OpenSignLabs opensignserver - Broken Object Level Authorization

Priority LOW 39CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00526 44th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenSignLabsopensignserverup to 2.37.0—No fix listedCNA
  • opensignserver VendorOpenSignLabs Affected up to 2.37.0 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-72689
  2. 2026-10-03 Alias added: GHSA-mgm4-2355-58g4

References

Advisory 1

  • TI-2026-62535 OpenSign through 2.41.3 Information Disclosure via getDocument CVSS 4.0HIGH 8.7
  • TI-2026-50929 OpenSignLabs opensignserver - Authentication Bypass CVSS 3.1HIGH 7.5
  • TI-2026-50926 OpenSignLabs opensignserver - Missing Authentication for Critical Function CVSS 3.1HIGH 7.5
  • TI-2026-50807 OpenSignLabs OpenSign - Information Disclosure CVSS 3.1HIGH 7.5
  • TI-2026-50804 OpenSignLabs OpenSign - Insecure Direct Object Reference CVSS 3.1HIGH 7.5
  • TI-2026-50802 OpenSignLabs OpenSign - Insecure Direct Object Reference CVSS 3.1HIGH 7.5
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences