Auth bypass in Heinlein Opencloud Reva
CVE-2026-23989
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.
Vulnerability class: Broken Access Control
EPSS: 0.003 (19.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N.
Affected products
- Heinlein Opencloud_reva
- Opencloud-eu Reva — versions < 2.40.3, >= 2.41.0, < 2.42.3
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-23989?
- CVE-2026-23989 is a high-severity vulnerability in Heinlein Opencloud Reva, classified under Incorrect Authorization. CVSS score: 8.2/10. Published 2026-02-06.
- How severe is CVE-2026-23989?
- High severity. CVSS v3 base score is 8.2 out of 10.