Vulnerability-Lookup

CVE-2026-40304 (GCVE-0-2026-40304)

Vulnerability from cvelistv5 – Published: 2026-04-17 21:04 – Updated: 2026-04-20 14:57

Title

zrok's broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records

Summary

zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the unaccess handler (controller/unaccess.go) contains a logical error in its ownership guard: when a frontend record has environment_id = NULL (the marker for admin-created global frontends), the condition short-circuits to false and allows the deletion to proceed without any ownership verification. A non-admin user who knows a global frontend token can call DELETE /api/v2/unaccess with any of their own environment IDs and permanently delete the global frontend, taking down all public shares routed through it. Version 2.0.1 patches the issue.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-20 14:51 UTC

CWE

CWE-284 - Improper Access Control
CWE-863 - Incorrect Authorization

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/openziti/zrok/security/advisor…	x_refsource_CONFIRM
https://github.com/openziti/zrok/releases/tag/v2.0.1	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
openziti	zrok	Affected: < 2.0.1	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-40304

Vulnerability from fkie_nvd - Published: 2026-04-17 22:16 - Updated: 2026-06-17 10:44

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/openziti/zrok/releases/tag/v2.0.1	Release Notes
	security-advisories@github.com	https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g	Vendor Advisory

Impacted products

	Vendor	Product	Version
	netfoundry	zrok	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "zrok",
          "vendor": "openziti",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.0.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:netfoundry:zrok:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "70C6F018-6D34-4A75-A49D-A795B0A5B056",
              "versionEndExcluding": "2.0.1",
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            }
          ],
          "negate": false,
          "operator": "OR"
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    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "zrok is software for sharing web services, files, and network resources. Prior to version 2.0.1, the unaccess handler (controller/unaccess.go) contains a logical error in its ownership guard: when a frontend record has environment_id = NULL (the marker for admin-created global frontends), the condition short-circuits to false and allows the deletion to proceed without any ownership verification. A non-admin user who knows a global frontend token can call DELETE /api/v2/unaccess with any of their own environment IDs and permanently delete the global frontend, taking down all public shares routed through it. Version 2.0.1 patches the issue."
    }
  ],
  "id": "CVE-2026-40304",
  "lastModified": "2026-06-17T10:44:58.387",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
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        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
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}

GHSA-3JPJ-V3XR-5H6G

Vulnerability from github – Published: 2026-04-16 21:09 – Updated: 2026-04-24 20:49

Summary

zrok: Broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records

Details

Summary The unaccess handler (controller/unaccess.go) contains a logical error in its ownership guard: when a frontend record has environment_id = NULL (the marker for admin-created global frontends), the condition short-circuits to false and allows the deletion to proceed without any ownership verification. A non-admin user who knows a global frontend token can call DELETE /api/v2/unaccess with any of their own environment IDs and permanently delete the global frontend, taking down all public shares routed through it.

Attack Vector: Network — the endpoint is a standard HTTP API call.

Attack Complexity: High — successful exploitation requires prior knowledge of a global frontend token. These tokens are not returned to non-admin users by any standard API endpoint; obtaining one requires an out-of-band step (e.g., leaked server logs, admin documentation for a self-hosted instance, or social engineering).

Privileges Required: Low — a valid user account with at least one registered environment is required; no admin privileges needed.

User Interaction: None.

Scope: Unchanged — the impact stays within the same server instance.

Confidentiality Impact: None — no data is disclosed.

Integrity Impact: None — no data is improperly modified; the record is deleted (not corrupted).

Availability Impact: High — deleting a global frontend disrupts every public share routed through it on the instance, constituting a platform-wide availability impact.

Affected Component controller/unaccess.go — unaccessHandler.Handle (line 56)

Severity

5.3 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/openziti/zrok"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.1.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/openziti/zrok/v2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40304"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-16T21:09:23Z",
    "nvd_published_at": "2026-04-17T22:16:32Z",
    "severity": "MODERATE"
  },
  "details": "Summary\nThe unaccess handler (controller/unaccess.go) contains a logical error in its ownership guard: when a frontend record has environment_id = NULL (the marker for admin-created global frontends), the condition short-circuits to false and allows the deletion to proceed without any ownership verification. A non-admin user who knows a global frontend token can call DELETE /api/v2/unaccess with any of their own environment IDs and permanently delete the global frontend, taking down all public shares routed through it.\n\nAttack Vector: Network \u2014 the endpoint is a standard HTTP API call.\n\nAttack Complexity: High \u2014 successful exploitation requires prior knowledge of a global frontend token. These tokens are not returned to non-admin users by any standard API endpoint; obtaining one requires an out-of-band step (e.g., leaked server logs, admin documentation for a self-hosted instance, or social engineering).\n\nPrivileges Required: Low \u2014 a valid user account with at least one registered environment is required; no admin privileges needed.\n\nUser Interaction: None.\n\nScope: Unchanged \u2014 the impact stays within the same server instance.\n\nConfidentiality Impact: None \u2014 no data is disclosed.\n\nIntegrity Impact: None \u2014 no data is improperly modified; the record is deleted (not corrupted).\n\nAvailability Impact: High \u2014 deleting a global frontend disrupts every public share routed through it on the instance, constituting a platform-wide availability impact.\n\nAffected Component\ncontroller/unaccess.go \u2014 unaccessHandler.Handle (line 56)",
  "id": "GHSA-3jpj-v3xr-5h6g",
  "modified": "2026-04-24T20:49:03Z",
  "published": "2026-04-16T21:09:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/openziti/zrok/security/advisories/GHSA-3jpj-v3xr-5h6g"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40304"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/openziti/zrok"
    },
    {
      "type": "WEB",
      "url": "https://github.com/openziti/zrok/releases/tag/v2.0.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "zrok: Broken ownership check in DELETE /api/v2/unaccess allows non-admin to delete global frontend records"
}

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.

Detection rules are retrieved from Rulezet.

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-2026-40304 (GCVE-0-2026-40304)

FKIE_CVE-2026-40304

GHSA-3JPJ-V3XR-5H6G

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Related by attack behaviour