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TI-2026-50804 Aliases CVE-2026-72545GHSA-4vpg-x7mh-3947

OpenSignLabs OpenSign - Insecure Direct Object Reference

Priority MEDIUM 40CWE-639Published · Updated

Key facts

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

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

Summary

An insecure direct object reference vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote attackers to write to any contact record via the updatecontacttour Parse cloud function. The function performs no authentication or authorization before updating the target contact record. An attacker can corrupt or overwrite contact data for any user in the system without credentials.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00536 45th 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
OpenSignLabsOpenSignup to 2.37.0—No fix listedCNA
  • OpenSign 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-2026-72545
  2. 2026-10-03 Alias added: GHSA-4vpg-x7mh-3947

References

Other 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-2026-50802 OpenSignLabs OpenSign - Insecure Direct Object Reference CVSS 3.1HIGH 7.5
  • TI-2026-50930 OpenSignLabs opensignserver - Missing Authorization 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