CVE-2026-72543: Opensignlabs Opensign

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

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.

Affected products

• Opensignlabs Opensign: up to and including 2.37.0

Published 2026-08-11. Last modified 2026-09-03.