Vulnerability-Lookup

CVE-2026-23989 (GCVE-0-2026-23989)

Vulnerability from cvelistv5 – Published: 2026-02-06 18:28 – Updated: 2026-02-06 18:52

Title

REVA Public Link Exploit

Summary

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.

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-06 18:51 UTC

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root Scorecard

References

2 references

URL	Tags
https://github.com/opencloud-eu/reva/security/adv…	x_refsource_CONFIRM
https://github.com/opencloud-eu/reva/commit/95aa2…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
opencloud-eu	reva	Affected: < 2.40.3 Affected: >= 2.41.0, < 2.42.3	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-23989

Vulnerability from fkie_nvd - Published: 2026-02-06 19:16 - Updated: 2026-06-17 10:22

Severity

8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/opencloud-eu/reva/commit/95aa2bc5d980eaf6cc134d75782b4f5ac7b36ae1	Patch
	security-advisories@github.com	https://github.com/opencloud-eu/reva/security/advisories/GHSA-9j2f-3rj3-wgpg	Vendor Advisory

Impacted products

	Vendor	Product	Version
	heinlein	opencloud_reva	*
	heinlein	opencloud_reva	*

JSON

To clipboard

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        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-9J2F-3RJ3-WGPG

Vulnerability from github – Published: 2026-02-05 20:32 – Updated: 2026-02-06 21:42

Summary

OpenCloud Reva has a Public Link Exploit

Details

Impact

A 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.

Details

Public 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.

Due 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.

It is not possible to bypass the public link scope via "normal" WebDAV requests so it is not possible to exploit this vulnerability via WebDAV.

Patches

Update to OpenCloud Reva version >= 2.40.3 for the 2.40.x versions.\ Update to OpenCloud Reva version >= 2.42.3 for the 2.41.x versions

Workarounds

There is no workaround because one cannot run Reva standalone from this project. Please check the OpenCloud Advisory how to mitigate the problem in an OpenCloud deployment via configuration.

For more information

If there are any questions or comments about this advisory:

Security Support: security@opencloud.eu
Technical Support: support@opencloud.eu

Severity

8.2 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Show details on source website

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.40.1"
      },
      "package": {
        "ecosystem": "Go",
        "name": "github.com/opencloud-eu/reva/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.40.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/opencloud-eu/reva/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.41.0"
            },
            {
              "fixed": "2.42.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-23989"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-02-05T20:32:53Z",
    "nvd_published_at": "2026-02-06T19:16:08Z",
    "severity": "HIGH"
  },
  "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 \u003e= 2.40.3 for the 2.40.x versions.\\\nUpdate to OpenCloud Reva version \u003e= 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)",
  "id": "GHSA-9j2f-3rj3-wgpg",
  "modified": "2026-02-06T21:42:15Z",
  "published": "2026-02-05T20:32:53Z",
  "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenCloud Reva has a Public Link Exploit"
}

OPENSUSE-SU-2026:10159-1

Vulnerability from csaf_opensuse - Published: 2026-02-06 00:00 - Updated: 2026-09-17 16:53

Summary

opencloud-server-5.0.2-1.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2026-23989.

CVE-2026-23989

8.1 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Recommended: 4 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-23989 (GCVE-0-2026-23989)

FKIE_CVE-2026-23989

GHSA-9J2F-3RJ3-WGPG

Impact

Details

Patches

Workarounds

For more information

OPENSUSE-SU-2026:10159-1

Tags

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