CVE-2026-23989: Heinlein Opencloud Reva

High severity, CVSS 8.1. EPSS: 0.3% chance of exploitation in the next 30 days.

REVA is an interoperability platform. Prior to 2.42.3 and 2.40.3, a bug in the GRPC authorization middleware of the "Reva" component of OpenCloud allows a malicious user to bypass the scope verification of a public link. By exploiting this via the the "archiver" service this can be leveraged to create an archive (zip or tar-file) containing all resources that this creator of the public link has access to. This vulnerability is fixed in 2.42.3 and 2.40.3.

Affected products

• Heinlein Opencloud Reva: before 2.40.3 (fixed in 2.40.3); from 2.41.0, before 2.42.3 (fixed in 2.42.3)

Published 2026-02-06. Last modified 2026-06-17.