CVE-2026-72545: Opensignlabs Opensign

High severity, CVSS 7.5. EPSS: 0.5% 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 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.

Affected products

• Opensignlabs Opensign: up to and including 2.37.0

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