Common Weakness Enumeration

CWE-639

Allowed

Authorization Bypass Through User-Controlled Key

Abstraction: Base · Status: Incomplete

The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

2790 vulnerabilities reference this CWE, most recent first.

CVE-2026-87829 (GCVE-0-2026-87829)

Vulnerability from cvelistv5 – Published: 2026-09-17 07:54 – Updated: 2026-09-17 12:09
VLAI
Title
Checkout Field Manager < 7.9.7 - Subscriber+ Arbitrary Attachment Deletion via Unvalidated Attachment ID Reparenting
Summary
The Checkout Field Manager (Checkout Manager) for WooCommerce WordPress plugin before 7.9.7 does not properly validate the ownership of an attachment before deleting it, allowing any authenticated user such as a customer to delete arbitrary media attachments belonging to other users.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 12:09 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
WPScan CNA
References
URL Tags
https://wpscan.com/vulnerability/8c76bf99-5d3e-45… exploitvdb-entrytechnical-description
Impacted products
Show details on NVD website

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CVE-2026-87809 (GCVE-0-2026-87809)

Vulnerability from cvelistv5 – Published: 2026-09-09 11:20 – Updated: 2026-09-18 17:23
VLAI
Title
Siyuan before v3.8.2 Information Disclosure via Export Preview
Summary
Siyuan before v3.8.2 fails to apply publish-access filtering to embedded blocks before rendering in the /api/export/preview and /api/lute/copyStdMarkdown endpoints. Attackers with reader access can retrieve the full rendered content of private, hidden, or publish-disabled blocks by accessing public documents containing embed queries that select those blocks.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:08 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
VulnCheck CNA
References
Impacted products
Vendor Product Version
siyuan-note siyuan Affected: 0 , < 3.8.2 (semver)
Unaffected: 3.8.2 (semver)
    cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-08-26 00:00
Show details on NVD website

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CVE-2026-87739 (GCVE-0-2026-87739)

Vulnerability from cvelistv5 – Published: 2026-09-24 06:46 – Updated: 2026-10-13 04:12
VLAI
Title
PaperCut MF/NG: User permissions are not evaluated on report generation
Summary
An improper authentication vulnerability in PaperCut MF/NG allows an unauthenticated, remote attacker to trigger report generation. By submitting report generation requests without valid credentials, an attacker can generate reports and gain unauthorized access to sensitive information.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-24 12:42 UTC
CWE
  • CWE-639 - Authorization bypass through User-Controlled key
Assigner
PaperCut CNA
Impacted products
Vendor Product Version
PaperCut PaperCut NG/MF Affected: 0 , < 24.1.10 (semver)
Affected: 25.0.0 , < 25.0.13 (semver)
Affected: 26.0.0 , < 26.0.5 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-87113 (GCVE-0-2026-87113)

Vulnerability from cvelistv5 – Published: 2026-09-16 19:42 – Updated: 2026-09-17 16:09
VLAI
Title
Tanium addressed an improper access controls vulnerability in Threat Response.
Summary
Tanium addressed an improper access controls vulnerability in Threat Response.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-17 16:09 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
Tanium CNA
References
Impacted products
Vendor Product Version
Tanium Threat Response Affected: 4.9 , < 4.9.449 (custom)
Affected: 4.12 , < 4.12.319 (custom)
Affected: 4.17 , < 4.17.291 (custom)
Create a notification for this product.
Date Public
2026-09-16 19:42
Show details on NVD website

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CVE-2026-87108 (GCVE-0-2026-87108)

Vulnerability from cvelistv5 – Published: 2026-10-09 05:54 – Updated: 2026-10-09 16:47
VLAI
Title
Ops Manager Improper Authorization in Daily Host Monitoring Retrieval
Summary
An authenticated Ops Manager user with a read-only project role can retrieve a daily host monitoring record associated with a different project when they possess the required record identifier. Insufficient ownership validation can expose deployment metadata, including host and configuration details.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 16:15 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
mongodb CNA
Impacted products
Vendor Product Version
MongoDB Ops Manager Affected: 7.0.0 , ≤ 7.0.23 (semver)
Affected: 8.0.0 , < 8.0.27 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-87098 (GCVE-0-2026-87098)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:09 – Updated: 2026-11-06 18:38
VLAI
Summary
Sensitive information disclosure due to improper authorization. The following products are affected: Acronis Cyber Protect 17 (Linux, Windows) before build 42587.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-06 18:13 UTC
CWE
Assigner
Acronis CNA
References
Impacted products
Vendor Product Version
Acronis Acronis Cyber Protect 17 Affected: unspecified , < 42587 (semver)
Create a notification for this product.
Show details on NVD website

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CVE-2026-87047 (GCVE-0-2026-87047)

Vulnerability from cvelistv5 – Published: 2026-09-09 02:06 – Updated: 2026-09-09 16:10
VLAI
Title
Tanium addressed an improper access controls vulnerability in Comply.
Summary
Tanium addressed an improper access controls vulnerability in Comply.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 15:59 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
Tanium CNA
References
Impacted products
Vendor Product Version
Tanium Comply Affected: 2.32 , < 2.32.252 (custom)
Affected: 2.35 , < 2.35.306 (custom)
Affected: 2.37 , < 2.37.308 (custom)
Create a notification for this product.
Date Public
2026-09-09 02:04
Show details on NVD website

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CVE-2026-87033 (GCVE-0-2026-87033)

Vulnerability from cvelistv5 – Published: 2026-09-09 02:08 – Updated: 2026-09-09 16:10
VLAI
Title
Tanium addressed an improper access controls vulnerability in Comply.
Summary
Tanium addressed an improper access controls vulnerability in Comply.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 15:59 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
Tanium CNA
References
Impacted products
Vendor Product Version
Tanium Comply Affected: 2.32 , < 2.32.252 (custom)
Affected: 2.35 , < 2.35.306 (custom)
Affected: 2.37 , < 2.37.308 (custom)
Create a notification for this product.
Date Public
2026-09-09 02:04
Show details on NVD website

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CVE-2026-87025 (GCVE-0-2026-87025)

Vulnerability from cvelistv5 – Published: 2026-09-09 02:07 – Updated: 2026-09-09 16:10
VLAI
Title
Tanium addressed an improper access controls vulnerability in Comply.
Summary
Tanium addressed an improper access controls vulnerability in Comply.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 15:59 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
Tanium CNA
References
Impacted products
Vendor Product Version
Tanium Comply Affected: 2.32 , < 2.32.252 (custom)
Affected: 2.35 , < 2.35.306 (custom)
Affected: 2.37 , < 2.37.308 (custom)
Create a notification for this product.
Date Public
2026-09-09 02:04
Show details on NVD website

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CVE-2026-87019 (GCVE-0-2026-87019)

Vulnerability from cvelistv5 – Published: 2026-09-09 02:06 – Updated: 2026-09-09 16:10
VLAI
Title
Tanium addressed an improper access controls vulnerability in Comply.
Summary
Tanium addressed an improper access controls vulnerability in Comply.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 16:00 UTC
CWE
  • CWE-639 - Authorization Bypass Through User-Controlled Key
Assigner
Tanium CNA
References
Impacted products
Vendor Product Version
Tanium Comply Affected: 2.32.252 , < 2.32.252 (custom)
Affected: 2.35.306 , < 2.35.306 (custom)
Affected: 2.37.308 , < 2.37.308 (custom)
Create a notification for this product.
Date Public
2026-09-09 02:04
Show details on NVD website

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              "versionType": "custom"
            },
            {
              "lessThan": "2.35.306",
              "status": "affected",
              "version": "2.35.306",
              "versionType": "custom"
            },
            {
              "lessThan": "2.37.308",
              "status": "affected",
              "version": "2.37.308",
              "versionType": "custom"
            }
          ]
        }
      ],
      "dateAssigned": "2026-09-08T17:02:36.927Z",
      "datePublic": "2026-09-09T02:04:25.050Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Tanium addressed an improper access controls vulnerability in Comply."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-639",
              "description": "Authorization Bypass Through User-Controlled Key",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-09T02:06:42.496Z",
        "orgId": "3938794e-25f5-4123-a1ba-5cbd7f104512",
        "shortName": "Tanium"
      },
      "references": [
        {
          "name": "TAN-2026-035",
          "url": "https://security.tanium.com/TAN-2026-035"
        }
      ],
      "title": "Tanium addressed an improper access controls vulnerability in Comply."
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3938794e-25f5-4123-a1ba-5cbd7f104512",
    "assignerShortName": "Tanium",
    "cveId": "CVE-2026-87019",
    "datePublished": "2026-09-09T02:06:42.496Z",
    "dateReserved": "2026-09-08T17:02:37.401Z",
    "dateUpdated": "2026-09-09T16:10:31.830Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Mitigation
Architecture and Design

For each and every data access, ensure that the user has sufficient privilege to access the record that is being requested.

Mitigation
Architecture and Design Implementation

Make sure that the key that is used in the lookup of a specific user's record is not controllable externally by the user or that any tampering can be detected.

Mitigation
Architecture and Design

Use encryption in order to make it more difficult to guess other legitimate values of the key or associate a digital signature with the key so that the server can verify that there has been no tampering.

No CAPEC attack patterns related to this CWE.