How severe is CVE-2026-23989?

CVE-2026-23989 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-23989 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23989?

CVE-2026-23989 affects Heinlein Opencloud Reva. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-23989?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-23989 have an EU (EUVD) identifier?

Yes. CVE-2026-23989 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5629.

When was CVE-2026-23989 published?

CVE-2026-23989 was published on 2026-02-06 and last updated on 2026-06-17.

CVE-2026-23989

CVE-2026-23989 is a high-severity vulnerability in Heinlein Opencloud Reva with a CVSS 3.x base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-863.

Key facts

Severity: High (CVSS 3.x base score 8.2)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-5629
Weakness: CWE-863
Affected product: Heinlein Opencloud Reva
Published: 2026-02-06
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-23989?: CVE-2026-23989 has a CVSS 3.x base score of 8.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-23989 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23989?: CVE-2026-23989 affects Heinlein Opencloud Reva. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-23989?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-23989 have an EU (EUVD) identifier?: Yes. CVE-2026-23989 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-5629.
When was CVE-2026-23989 published?: CVE-2026-23989 was published on 2026-02-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:heinlein:opencloud_reva:*:*:*:*:*:*:*:*

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