Authorization Bypass in OpenCloud's Reva Platform
CVE-2026-23989

8.2HIGH

Key Information:

Vendor

Opencloud-eu

Status
Reva
Vendor
CVE Published:
6 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-23989?

The Reva interoperability platform from OpenCloud contains a vulnerability in the GRPC authorization middleware that allows malicious users to bypass scope verification associated with public links. This flaw can be exploited through the archiver service to create archives (zip or tar files) containing sensitive resources accessible to the creator of the public link. This issue affects Reva versions prior to 2.42.3 and 2.40.3, and the problem has been addressed in these subsequent releases.

Affected Version(s)

reva < 2.40.3 < 2.40.3

reva >= 2.41.0, < 2.42.3 < 2.41.0, 2.42.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

cve-2026-23989-opencloud-lab
Created by dinosn

References

https://github.com/opencloud-eu/reva/security/advisories/...
x_refsource_CONFIRM
https://github.com/opencloud-eu/reva/commit/95aa2bc5d980e...
x_refsource_MISC

CVSS V3.1

Score:
8.2
Severity:
HIGH
Confidentiality:
High
Integrity:
Low
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

.