CVE-2026-23989: Github.com/opencloud eu/reva/v2 OpenCloud Reva Has A Public Vulnerability
HIGHCVE-2026-23989 is a HIGH (CVSS 8.2) opencloud reva has a public vulnerability (CWE-863: Incorrect Authorization) affecting Github.com/opencloud eu/reva/v2 libraries in the Go ecosystem. The issue involves opencloud reva has a public link exploit. Remediation is available by upgrading affected packages to version 2.40.3, 2.42.3.
CVE-2026-23989 at a Glance
Security Impact
CVSS: 8.2
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N).
How to Fix CVE-2026-23989
To remediate this vulnerability, upgrade all affected Github.com/opencloud eu/reva/v2 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade github.com/opencloud-eu/reva/v2 to 2.40.3Upgrade github.com/opencloud-eu/reva/v2 to 2.42.3Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for github.com/opencloud-eu/reva/v2How to Check if You Are Affected
To determine whether your application is affected by CVE-2026-23989, inspect your project dependencies for Github.com/opencloud eu/reva/v2:
inspect dependencies for github.com/opencloud-eu/reva/v2Analyze the terminal output to locate any version of Github.com/opencloud eu/reva/v2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.40.3), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. In Github.com/opencloud eu/reva/v2, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-23989 Affected Github.com/opencloud eu/reva/v2 Versions
2 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
github.com/opencloud-eu/reva/v2
|
Go |
< 2.40.3
|
2.40.3
|
|
github.com/opencloud-eu/reva/v2
|
Go |
≥ 2.41.0
< 2.42.3
|
2.42.3
|
References
Frequently Asked Questions
What is CVE-2026-23989?
Which Github.com/opencloud eu/reva/v2 versions are affected?
What version fixes CVE-2026-23989?
Is github.com/opencloud-eu/reva/v2 affected?
What is the CVSS score of CVE-2026-23989?
What CWE is associated with CVE-2026-23989?
How can I check Go dependencies for CVE-2026-23989?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-9j2f-3rj3-wgpg",
"modified" : "2026-02-06T21:42:15Z",
"published" : "2026-02-05T20:32:53Z",
"aliases" : [ "CVE-2026-23989" ],
"summary" : "OpenCloud Reva has a Public Link Exploit",
"details" : "### Impact\n\nA security issue was discovered in Reva based products that enables a malicious user to bypass the scope validation of a public link, allowing it to access resources outside the scope of a public link.\n\n### Details\n\nPublic link shares in OpenCloud are bound to a specific scope (usually a file or directory). Anonymous users accessing resources via this public link share are only allowed to access the share resource itself and, in case of a directory or space root, all child resources of it.\n\nDue to a bug in the GRPC authorization middleware of the \"Reva\" component of OpenCloud a malicious user is able to bypass the scope verification. 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.\n\nIt is not possible to bypass the public link scope via \"normal\" WebDAV requests so it is not possible to exploit this vulnerability via WebDAV.\n\n### Patches\n\nUpdate to OpenCloud Reva version >= 2.40.3 for the 2.40.x versions.\\\nUpdate to OpenCloud Reva version >= 2.42.3 for the 2.41.x versions\n\n### Workarounds\n\nThere is no workaround because one cannot run Reva standalone from this project. Please check the [OpenCloud Advisory](https://github.com/opencloud-eu/opencloud/security/advisories/GHSA-vf5j-r2hw-2hrw) how to mitigate the problem in an OpenCloud deployment via configuration.\n\n### For more information\n\nIf there are any questions or comments about this advisory:\n\n- Security Support: [security@opencloud.eu](mailto:security@opencloud.eu)\n- Technical Support: [support@opencloud.eu](mailto:support@opencloud.eu)",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/opencloud-eu/reva/v2"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.40.3"
} ]
} ],
"database_specific" : {
"last_known_affected_version_range" : "<= 2.40.1"
}
}, {
"package" : {
"ecosystem" : "Go",
"name" : "github.com/opencloud-eu/reva/v2"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.41.0"
}, {
"fixed" : "2.42.3"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/opencloud-eu/reva/security/advisories/GHSA-9j2f-3rj3-wgpg"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-23989"
}, {
"type" : "WEB",
"url" : "https://github.com/opencloud-eu/reva/commit/95aa2bc5d980eaf6cc134d75782b4f5ac7b36ae1"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/opencloud-eu/reva"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-22", "CWE-863" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-02-05T20:32:53Z",
"nvd_published_at" : "2026-02-06T19:16:08Z"
}
}