CVE-2026-23989: REVA is an interoperability platform

Routine

HIGH 8.2REMOTEUPGRADE

CVE-2026-23989 is a high-severity flaw (CVSS 8.2) affecting opencloud reva. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-863
Published	2026-02-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: heinlein

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-02-06 19:16 UTCPublished CVE record published
2026-06-17 10:22 UTCUpdated Record last modified

heinlein opencloud reva UPGRADE

Affected: < 2.40.3 · >= 2.41.0 and < 2.42.3

Fixed in: 2.40.3, 2.42.3

Safe to downgrade to: a release before 2.41.0

1. Check installed version

apt-cache policy opencloud-reva || rpm -q opencloud-reva || opencloud-reva --version

2. UPGRADE to 2.40.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade opencloud-reva

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade opencloud-reva

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.41.0 (Debian / Ubuntu)

apt-cache madison opencloud-reva sudo apt install opencloud-reva=<VERSION_BEFORE_2.41.0> sudo apt-mark hold opencloud-reva

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list opencloud-reva sudo dnf downgrade opencloud-reva-<VERSION_BEFORE_2.41.0> sudo dnf versionlock add opencloud-reva

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-23989?

opencloud reva: upgrade to 2.40.3, 2.42.3. Exact commands for each OS are on this page.

Is CVE-2026-23989 being exploited?

CVE-2026-23989 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-23989 affect?

CVE-2026-23989 affects opencloud reva. Severity is high (CVSS 8.2). 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

How urgent is CVE-2026-23989?

Priority 39/100. High severity; Remotely exploitable, no login, no user action

References

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