CVE-2026-72544: Opensignlabs Opensign

High severity, CVSS 7.5. EPSS: 0.3% chance of exploitation in the next 30 days.

An integrity verification vulnerability in OpenSignLabs OpenSign through 2.37.0 allows unauthenticated remote attackers to forge document audit-trail entries via the triggerevent Parse cloud function. The function accepts viewer identity and IP address as caller-supplied parameters without authentication, allowing fabrication of arbitrary audit log entries. An attacker can tamper with the legal audit trail of any signed document, undermining non-repudiation.

Affected products

• Opensignlabs Opensign: up to and including 2.37.0

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